21031131002 has 16 divisors (see below), whose sum is σ = 37027783680. Its totient is φ = 8769737808.

The previous prime is 21031130983. The next prime is 21031131019. The reversal of 21031131002 is 20013113012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20299802 + ... + 20300837.

It is an arithmetic number, because the mean of its divisors is an integer number (2314236480).

Almost surely, 2^21031131002 is an apocalyptic number.

21031131002 is a deficient number, since it is larger than the sum of its proper divisors (15996652678).

21031131002 is a wasteful number, since it uses less digits than its factorization.

21031131002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40600685.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21031131002 its reverse (20013113012), we get a palindrome (41044244014).

The spelling of 21031131002 in words is "twenty-one billion, thirty-one million, one hundred thirty-one thousand, two".