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21111121112001 = 312799549811733
BaseRepresentation
bin1001100110011010100001…
…10111111110101111000001
32202202012111022212022001120
410303031100313332233001
510231341034001041001
6112522152023422453
74306141155444324
oct463152067765701
982665438768046
1021111121112001
1167aa1a3558088
12244b5878b4a29
13ba1a0210c74b
1452dad87207bb
15269236d4b236
hex133350dfebc1

21111121112001 has 8 divisors (see below), whose sum is σ = 28150360780800. Its totient is φ = 14072981092272.

The previous prime is 21111121111967. The next prime is 21111121112021. The reversal of 21111121112001 is 10021112111112.

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

It is a de Polignac number, because none of the positive numbers 2k-21111121112001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21111121112021) 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, 274867470 + ... + 274944263.

It is an arithmetic number, because the mean of its divisors is an integer number (3518795097600).

Almost surely, 221111121112001 is an apocalyptic number.

It is an amenable number.

21111121112001 is a deficient number, since it is larger than the sum of its proper divisors (7039239668799).

21111121112001 is a wasteful number, since it uses less digits than its factorization.

21111121112001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549824535.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21111121112001 its reverse (10021112111112), we get a palindrome (31132233223113).

The spelling of 21111121112001 in words is "twenty-one trillion, one hundred eleven billion, one hundred twenty-one million, one hundred twelve thousand, one".

Divisors: 1 3 12799 38397 549811733 1649435199 7037040370667 21111121112001