21475984320 has 168 divisors, whose sum is σ = 84421150944. Its totient is φ = 4908791808.

The previous prime is 21475984253. The next prime is 21475984379. The reversal of 21475984320 is 2348957412.

21475984320 is a `hidden beast` number, since 2 + 14 + 7 + 598 + 43 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a super-2 number, since 2×21475984320² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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, 512479 + ... + 552798.

Almost surely, 2^21475984320 is an apocalyptic number.

21475984320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21475984320 is an abundant number, since it is smaller than the sum of its proper divisors (62945166624).

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

21475984320 is a wasteful number, since it uses less digits than its factorization.

21475984320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1065307 (or 1065294 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 21475984320 in words is "twenty-one billion, four hundred seventy-five million, nine hundred eighty-four thousand, three hundred twenty".