21623518152 has 48 divisors (see below), whose sum is σ = 62008621740. Its totient is φ = 6783848448.

The previous prime is 21623518151. The next prime is 21623518183. The reversal of 21623518152 is 25181532612.

21623518152 is a `hidden beast` number, since 2 + 1 + 623 + 5 + 18 + 15 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19663331076 + 1960187076 = 140226^2 + 44274^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21623518151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8831913 + ... + 8834360.

Almost surely, 2^21623518152 is an apocalyptic number.

It is an amenable number.

21623518152 is an abundant number, since it is smaller than the sum of its proper divisors (40385103588).

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

21623518152 is a wasteful number, since it uses less digits than its factorization.

21623518152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17666302 (or 17666295 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The spelling of 21623518152 in words is "twenty-one billion, six hundred twenty-three million, five hundred eighteen thousand, one hundred fifty-two".