21102130402 has 4 divisors (see below), whose sum is σ = 31653195606. Its totient is φ = 10551065200.

The previous prime is 21102130397. The next prime is 21102130471. The reversal of 21102130402 is 20403120112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21045595041 + 56535361 = 145071^2 + 7519^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275532599 + ... + 5275532602.

Almost surely, 2^21102130402 is an apocalyptic number.

21102130402 is a deficient number, since it is larger than the sum of its proper divisors (10551065204).

21102130402 is a wasteful number, since it uses less digits than its factorization.

21102130402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551065203.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21102130402 its reverse (20403120112), we get a palindrome (41505250514).

The spelling of 21102130402 in words is "twenty-one billion, one hundred two million, one hundred thirty thousand, four hundred two".