21311231202210 has 64 divisors (see below), whose sum is σ = 51372086976000. Its totient is φ = 5657990618112.

The previous prime is 21311231202127. The next prime is 21311231202211. The reversal of 21311231202210 is 1220213211312.

It is not an unprimeable number, because it can be changed into a prime (21311231202211) 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, 33013662 + ... + 33652998.

It is an arithmetic number, because the mean of its divisors is an integer number (802688859000).

Almost surely, 2^{21311231202210} is an apocalyptic number.

21311231202210 is an abundant number, since it is smaller than the sum of its proper divisors (30060855773790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21311231202210 is a wasteful number, since it uses less digits than its factorization.

21311231202210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644235.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 21311231202210 its reverse (1220213211312), we get a palindrome (22531444413522).

It can be divided in two parts, 2131123 and 1202210, that added together give a palindrome (3333333).

The spelling of 21311231202210 in words is "twenty-one trillion, three hundred eleven billion, two hundred thirty-one million, two hundred two thousand, two hundred ten".