21604150320 has 40 divisors (see below), whose sum is σ = 66972866736. Its totient is φ = 5761106688.

The previous prime is 21604150319. The next prime is 21604150349. The reversal of 21604150320 is 2305140612.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×21604150320² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45008407 + ... + 45008886.

Almost surely, 2^21604150320 is an apocalyptic number.

21604150320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21604150320 is an abundant number, since it is smaller than the sum of its proper divisors (45368716416).

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

21604150320 is a wasteful number, since it uses less digits than its factorization.

21604150320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90017309 (or 90017303 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21604150320 its reverse (2305140612), we get a palindrome (23909290932).

The spelling of 21604150320 in words is "twenty-one billion, six hundred four million, one hundred fifty thousand, three hundred twenty".