21975062400 has 384 divisors, whose sum is σ = 80957318400. Its totient is φ = 5821102080.

The previous prime is 21975062387. The next prime is 21975062423. The reversal of 21975062400 is 426057912.

21975062400 is a `hidden beast` number, since 2 + 197 + 5 + 0 + 62 + 400 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14428039 + ... + 14429561.

It is an arithmetic number, because the mean of its divisors is an integer number (210826350).

Almost surely, 2^21975062400 is an apocalyptic number.

21975062400 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 21975062400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40478659200).

21975062400 is an abundant number, since it is smaller than the sum of its proper divisors (58982256000).

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

21975062400 is a wasteful number, since it uses less digits than its factorization.

21975062400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723 (or 1700 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21975062400 in words is "twenty-one billion, nine hundred seventy-five million, sixty-two thousand, four hundred".