21600149904 has 40 divisors (see below), whose sum is σ = 62000431520. Its totient is φ = 7200049824.

The previous prime is 21600149887. The next prime is 21600149927. The reversal of 21600149904 is 40994100612.

It is a happy number.

21600149904 is a `hidden beast` number, since 2 + 1 + 600 + 1 + 49 + 9 + 0 + 4 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24999742 + ... + 25000605.

It is an arithmetic number, because the mean of its divisors is an integer number (1550010788).

Almost surely, 2^21600149904 is an apocalyptic number.

21600149904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21600149904 is an abundant number, since it is smaller than the sum of its proper divisors (40400281616).

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

21600149904 is a wasteful number, since it uses less digits than its factorization.

21600149904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50000364 (or 50000352 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The spelling of 21600149904 in words is "twenty-one billion, six hundred million, one hundred forty-nine thousand, nine hundred four".