21120211001021 has 16 divisors (see below), whose sum is σ = 23119952114688. Its totient is φ = 19133807655600.

The previous prime is 21120211001009. The next prime is 21120211001047. The reversal of 21120211001021 is 12010011202112.

It is a de Polignac number, because none of the positive numbers 2^k-21120211001021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120211000987 and 21120211001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120211001921) 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, 7058786 + ... + 9595148.

It is an arithmetic number, because the mean of its divisors is an integer number (1444997007168).

Almost surely, 2^{21120211001021} is an apocalyptic number.

It is an amenable number.

21120211001021 is a deficient number, since it is larger than the sum of its proper divisors (1999741113667).

21120211001021 is a wasteful number, since it uses less digits than its factorization.

21120211001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2538992.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21120211001021 its reverse (12010011202112), we get a palindrome (33130222203133).

The spelling of 21120211001021 in words is "twenty-one trillion, one hundred twenty billion, two hundred eleven million, one thousand, twenty-one".