21100112001021 has 8 divisors (see below), whose sum is σ = 28133572161024. Its totient is φ = 14066696587520.

The previous prime is 21100112001013. The next prime is 21100112001043. The reversal of 21100112001021 is 12010021100112.

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

It is a cyclic number.

It is not a de Polignac number, because 21100112001021 - 2³ = 21100112001013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100112000988 and 21100112001006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100112001061) 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, 10070436 + ... + 11983901.

It is an arithmetic number, because the mean of its divisors is an integer number (3516696520128).

Almost surely, 2^{21100112001021} is an apocalyptic number.

It is an amenable number.

21100112001021 is a deficient number, since it is larger than the sum of its proper divisors (7033460160003).

21100112001021 is a wasteful number, since it uses less digits than its factorization.

21100112001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22373251.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21100112001021 its reverse (12010021100112), we get a palindrome (33110133101133).

Subtracting from 21100112001021 its reverse (12010021100112), we obtain a palindrome (9090090900909).

The spelling of 21100112001021 in words is "twenty-one trillion, one hundred billion, one hundred twelve million, one thousand, twenty-one".