21630510180 has 72 divisors (see below), whose sum is σ = 65663462592. Its totient is φ = 5763660096.

The previous prime is 21630510151. The next prime is 21630510191. The reversal of 21630510180 is 8101503612.

21630510180 is a `hidden beast` number, since 2 + 1 + 630 + 5 + 10 + 18 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 189289 + ... + 281231.

It is an arithmetic number, because the mean of its divisors is an integer number (911992536).

Almost surely, 2^21630510180 is an apocalyptic number.

21630510180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21630510180 is an abundant number, since it is smaller than the sum of its proper divisors (44032952412).

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

21630510180 is a wasteful number, since it uses less digits than its factorization.

21630510180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93265 (or 93260 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The spelling of 21630510180 in words is "twenty-one billion, six hundred thirty million, five hundred ten thousand, one hundred eighty".