21479515200 has 1680 divisors, whose sum is σ = 99238856640. Its totient is φ = 4478976000.

The previous prime is 21479515177. The next prime is 21479515217. The reversal of 21479515200 is 251597412.

21479515200 is a `hidden beast` number, since 2 + 1 + 47 + 95 + 1 + 520 + 0 = 666.

It is a super-2 number, since 2×21479515200² (a number of 21 digits) contains 22 as substring.

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

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 352123170 + ... + 352123230.

It is an arithmetic number, because the mean of its divisors is an integer number (59070748).

Almost surely, 2^21479515200 is an apocalyptic number.

21479515200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21479515200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49619428320).

21479515200 is an abundant number, since it is smaller than the sum of its proper divisors (77759341440).

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

21479515200 is a wasteful number, since it uses less digits than its factorization.

21479515200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 114 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 36.

The spelling of 21479515200 in words is "twenty-one billion, four hundred seventy-nine million, five hundred fifteen thousand, two hundred".