21120102011021 has 16 divisors (see below), whose sum is σ = 24285571153536. Its totient is φ = 18214178342976.

The previous prime is 21120102011003. The next prime is 21120102011023. The reversal of 21120102011021 is 12011020102112.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21120102011021 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21120102010987 and 21120102011005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120102011023) 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, 821333570 + ... + 821359283.

It is an arithmetic number, because the mean of its divisors is an integer number (1517848197096).

Almost surely, 2^{21120102011021} is an apocalyptic number.

It is an amenable number.

21120102011021 is a deficient number, since it is larger than the sum of its proper divisors (3165469142515).

21120102011021 is a wasteful number, since it uses less digits than its factorization.

21120102011021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642692932.

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

Adding to 21120102011021 its reverse (12011020102112), we get a palindrome (33131122113133).

The spelling of 21120102011021 in words is "twenty-one trillion, one hundred twenty billion, one hundred two million, eleven thousand, twenty-one".