21031120102 has 16 divisors (see below), whose sum is σ = 34352103600. Its totient is φ = 9618588000.

The previous prime is 21031120021. The next prime is 21031120129. The reversal of 21031120102 is 20102113012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9541149 + ... + 9543352.

It is an arithmetic number, because the mean of its divisors is an integer number (2147006475).

Almost surely, 2^21031120102 is an apocalyptic number.

21031120102 is a deficient number, since it is larger than the sum of its proper divisors (13320983498).

21031120102 is a wasteful number, since it uses less digits than its factorization.

21031120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19084551.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21031120102 its reverse (20102113012), we get a palindrome (41133233114).

The spelling of 21031120102 in words is "twenty-one billion, thirty-one million, one hundred twenty thousand, one hundred two".