21156171150 has 48 divisors (see below), whose sum is σ = 52522714224. Its totient is φ = 5635687680.

The previous prime is 21156171149. The next prime is 21156171151. The reversal of 21156171150 is 5117165112.

It is an interprime number because it is at equal distance from previous prime (21156171149) and next prime (21156171151).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21156171151) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68952 + ... + 216948.

It is an arithmetic number, because the mean of its divisors is an integer number (1094223213).

Almost surely, 2^21156171150 is an apocalyptic number.

21156171150 is an abundant number, since it is smaller than the sum of its proper divisors (31366543074).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21156171150 is a wasteful number, since it uses less digits than its factorization.

21156171150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148965 (or 148960 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 30.

The spelling of 21156171150 in words is "twenty-one billion, one hundred fifty-six million, one hundred seventy-one thousand, one hundred fifty".