21013120102 has 16 divisors (see below), whose sum is σ = 34519600080. Its totient is φ = 9533983392.

The previous prime is 21013120099. The next prime is 21013120103. The reversal of 21013120102 is 20102131012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013120103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6847593 + ... + 6850660.

It is an arithmetic number, because the mean of its divisors is an integer number (2157475005).

Almost surely, 2^21013120102 is an apocalyptic number.

21013120102 is a deficient number, since it is larger than the sum of its proper divisors (13506479978).

21013120102 is a wasteful number, since it uses less digits than its factorization.

21013120102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13698327.

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

Adding to 21013120102 its reverse (20102131012), we get a palindrome (41115251114).

The spelling of 21013120102 in words is "twenty-one billion, thirteen million, one hundred twenty thousand, one hundred two".