210021211021 has 16 divisors (see below), whose sum is σ = 213285427200. Its totient is φ = 206784688320.

The previous prime is 210021211007. The next prime is 210021211051. The reversal of 210021211021 is 120112120012.

It is a cyclic number.

It is not a de Polignac number, because 210021211021 - 2²⁷ = 209886993293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021210992 and 210021211010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210021211051) 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, 24425295 + ... + 24433891.

It is an arithmetic number, because the mean of its divisors is an integer number (13330339200).

Almost surely, 2^210021211021 is an apocalyptic number.

It is an amenable number.

210021211021 is a deficient number, since it is larger than the sum of its proper divisors (3264216179).

210021211021 is a wasteful number, since it uses less digits than its factorization.

210021211021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10164.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 210021211021 its reverse (120112120012), we get a palindrome (330133331033).

The spelling of 210021211021 in words is "two hundred ten billion, twenty-one million, two hundred eleven thousand, twenty-one".