21021000210231 has 16 divisors (see below), whose sum is σ = 32036167601664. Its totient is φ = 12010437389664.

The previous prime is 21021000210167. The next prime is 21021000210233. The reversal of 21021000210231 is 13201200012012.

It is not a de Polignac number, because 21021000210231 - 2⁶ = 21021000210167 is a prime.

It is a super-2 number, since 2×21021000210231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21021000210231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021000210233) 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, 64948500 + ... + 65271353.

It is an arithmetic number, because the mean of its divisors is an integer number (2002260475104).

Almost surely, 2^{21021000210231} is an apocalyptic number.

21021000210231 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21021000210231 is a deficient number, since it is larger than the sum of its proper divisors (11015167391433).

21021000210231 is a wasteful number, since it uses less digits than its factorization.

21021000210231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130227550.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21021000210231 its reverse (13201200012012), we get a palindrome (34222200222243).

The spelling of 21021000210231 in words is "twenty-one trillion, twenty-one billion, two hundred ten thousand, two hundred thirty-one".