21021210213311 has 32 divisors (see below), whose sum is σ = 26361870336000. Its totient is φ = 16284387581280.

The previous prime is 21021210213293. The next prime is 21021210213319. The reversal of 21021210213311 is 11331201212012.

It is not a de Polignac number, because 21021210213311 - 2³⁰ = 21020136471487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21021210213319) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10069916 + ... + 11976878.

It is an arithmetic number, because the mean of its divisors is an integer number (823808448000).

Almost surely, 2^{21021210213311} is an apocalyptic number.

21021210213311 is a deficient number, since it is larger than the sum of its proper divisors (5340660122689).

21021210213311 is a wasteful number, since it uses less digits than its factorization.

21021210213311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907819.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 21021210213311 its reverse (11331201212012), we get a palindrome (32352411425323).

The spelling of 21021210213311 in words is "twenty-one trillion, twenty-one billion, two hundred ten million, two hundred thirteen thousand, three hundred eleven".