21021131202131 has 4 divisors (see below), whose sum is σ = 21021140416200. Its totient is φ = 21021121988064.

The previous prime is 21021131202119. The next prime is 21021131202167. The reversal of 21021131202131 is 13120213112012.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21021131202131 - 2⁶ = 21021131202067 is a prime.

It is a super-2 number, since 2×21021131202131² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21021131208131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1626635 + ... + 6684923.

It is an arithmetic number, because the mean of its divisors is an integer number (5255285104050).

Almost surely, 2^{21021131202131} is an apocalyptic number.

21021131202131 is a deficient number, since it is larger than the sum of its proper divisors (9214069).

21021131202131 is an equidigital number, since it uses as much as digits as its factorization.

21021131202131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9214068.

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

Adding to 21021131202131 its reverse (13120213112012), we get a palindrome (34141344314143).

The spelling of 21021131202131 in words is "twenty-one trillion, twenty-one billion, one hundred thirty-one million, two hundred two thousand, one hundred thirty-one".