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210221112011021 = 29461125411253849
BaseRepresentation
bin101111110011000111101010…
…101101001010100100001101
31000120022221102202010021111022
4233303013222231022210031
5210023230314133323041
62023034125020203525
762164655062032506
oct5763075255124415
91016287382107438
10210221112011021
1160a8a300305961
121b6b23150995a5
13903b9c5608b87
1439caa82aa3bad
151948500b2c24b
hexbf31eab4a90d

210221112011021 has 16 divisors (see below), whose sum is σ = 217959403662000. Its totient is φ = 202515510489600.

The previous prime is 210221112010937. The next prime is 210221112011033. The reversal of 210221112011021 is 120110211122012.

Adding to 210221112011021 its reverse (120110211122012), we get a palindrome (330331323133033).

It can be written as a sum of positive squares in 8 ways, for example, as 46186308100 + 210174925702921 = 214910^2 + 14497411^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221112011021 - 226 = 210221044902157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221112011621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 167033705 + ... + 168287553.

It is an arithmetic number, because the mean of its divisors is an integer number (13622462728875).

Almost surely, 2210221112011021 is an apocalyptic number.

It is an amenable number.

210221112011021 is a deficient number, since it is larger than the sum of its proper divisors (7738291650979).

210221112011021 is a wasteful number, since it uses less digits than its factorization.

210221112011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266880.

The product of its (nonzero) digits is 32, while the sum is 17.

The spelling of 210221112011021 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twelve million, eleven thousand, twenty-one".

Divisors: 1 29 461 12541 13369 363689 1253849 5781401 36361621 167660629 578024389 15724520309 16762707281 456011088961 7249003862449 210221112011021