21110706172 has 6 divisors (see below), whose sum is σ = 36943735808. Its totient is φ = 10555353084.

The previous prime is 21110706163. The next prime is 21110706241. The reversal of 21110706172 is 27160701112.

It is a self number, because there is not a number n which added to its sum of digits gives 21110706172.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2638838268 + ... + 2638838275.

Almost surely, 2^21110706172 is an apocalyptic number.

It is an amenable number.

21110706172 is a deficient number, since it is larger than the sum of its proper divisors (15833029636).

21110706172 is a wasteful number, since it uses less digits than its factorization.

21110706172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277676547 (or 5277676545 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 28.

The spelling of 21110706172 in words is "twenty-one billion, one hundred ten million, seven hundred six thousand, one hundred seventy-two".