21170238902 has 16 divisors (see below), whose sum is σ = 33059622960. Its totient is φ = 10155014688.

The previous prime is 21170238883. The next prime is 21170238913. The reversal of 21170238902 is 20983207112.

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, 1153328 + ... + 1171539.

It is an arithmetic number, because the mean of its divisors is an integer number (2066226435).

Almost surely, 2^21170238902 is an apocalyptic number.

21170238902 is a deficient number, since it is larger than the sum of its proper divisors (11889384058).

21170238902 is a wasteful number, since it uses less digits than its factorization.

21170238902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2325055.

The product of its (nonzero) digits is 12096, while the sum is 35.

The spelling of 21170238902 in words is "twenty-one billion, one hundred seventy million, two hundred thirty-eight thousand, nine hundred two".