21519168902 has 16 divisors (see below), whose sum is σ = 40243640832. Its totient is φ = 8384091720.

The previous prime is 21519168901. The next prime is 21519168917. The reversal of 21519168902 is 20986191512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21519168901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69867278 + ... + 69867585.

It is an arithmetic number, because the mean of its divisors is an integer number (2515227552).

Almost surely, 2^21519168902 is an apocalyptic number.

21519168902 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21519168902 is a deficient number, since it is larger than the sum of its proper divisors (18724471930).

21519168902 is a wasteful number, since it uses less digits than its factorization.

21519168902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139734883.

The product of its (nonzero) digits is 77760, while the sum is 44.

The spelling of 21519168902 in words is "twenty-one billion, five hundred nineteen million, one hundred sixty-eight thousand, nine hundred two".