210021111112021 has 16 divisors (see below), whose sum is σ = 230069470276800. Its totient is φ = 190132040505600.

The previous prime is 210021111112019. The next prime is 210021111112049. The reversal of 210021111112021 is 120211111120012.

210021111112021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 210021111112021 - 2¹ = 210021111112019 is a prime.

It is a super-2 number, since 2×210021111112021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210021111111986 and 210021111112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021111112621) 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, 128714475 + ... + 130335943.

It is an arithmetic number, because the mean of its divisors is an integer number (14379341892300).

Almost surely, 2^{210021111112021} is an apocalyptic number.

It is an amenable number.

210021111112021 is a deficient number, since it is larger than the sum of its proper divisors (20048359164779).

210021111112021 is a wasteful number, since it uses less digits than its factorization.

210021111112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670580.

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

Adding to 210021111112021 its reverse (120211111120012), we get a palindrome (330232222232033).

The spelling of 210021111112021 in words is "two hundred ten trillion, twenty-one billion, one hundred eleven million, one hundred twelve thousand, twenty-one".