21500231645102 has 16 divisors (see below), whose sum is σ = 36884502351360. Its totient is φ = 9207644393688.

The previous prime is 21500231645099. The next prime is 21500231645111. The reversal of 21500231645102 is 20154613200512.

It is a congruent number.

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, 561696602 + ... + 561734877.

It is an arithmetic number, because the mean of its divisors is an integer number (2305281396960).

Almost surely, 2^{21500231645102} is an apocalyptic number.

21500231645102 is a deficient number, since it is larger than the sum of its proper divisors (15384270706258).

21500231645102 is a wasteful number, since it uses less digits than its factorization.

21500231645102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1123432855.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 21500231645102 its reverse (20154613200512), we get a palindrome (41654844845614).

The spelling of 21500231645102 in words is "twenty-one trillion, five hundred billion, two hundred thirty-one million, six hundred forty-five thousand, one hundred two".