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21101201 = 1110917599
BaseRepresentation
bin101000001111…
…1101010010001
31110201001101222
41100133222101
520400214301
62032134425
7344233352
oct120375221
943631358
1021101201
1110a02710
127097415
1344aa724
142b33d29
151cbc31b
hex141fa91

21101201 has 8 divisors (see below), whose sum is σ = 23232000. Its totient is φ = 19005840.

The previous prime is 21101123. The next prime is 21101207. The reversal of 21101201 is 10210112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-21101201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21101207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7601 + ... + 9998.

It is an arithmetic number, because the mean of its divisors is an integer number (2904000).

Almost surely, 221101201 is an apocalyptic number.

It is an amenable number.

21101201 is a deficient number, since it is larger than the sum of its proper divisors (2130799).

21101201 is a wasteful number, since it uses less digits than its factorization.

21101201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17719.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 21101201 is about 4593.6043582355. The cubic root of 21101201 is about 276.3348915681.

Adding to 21101201 its reverse (10210112), we get a palindrome (31311313).

The spelling of 21101201 in words is "twenty-one million, one hundred one thousand, two hundred one".

Divisors: 1 11 109 1199 17599 193589 1918291 21101201