21975900378 has 16 divisors (see below), whose sum is σ = 44404913280. Its totient is φ = 7249781376.

The previous prime is 21975900319. The next prime is 21975900383. The reversal of 21975900378 is 87300957912.

It is a self number, because there is not a number n which added to its sum of digits gives 21975900378.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18879058 + ... + 18880221.

It is an arithmetic number, because the mean of its divisors is an integer number (2775307080).

Almost surely, 2^21975900378 is an apocalyptic number.

21975900378 is an abundant number, since it is smaller than the sum of its proper divisors (22429012902).

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

21975900378 is a wasteful number, since it uses less digits than its factorization.

21975900378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37759381.

The product of its (nonzero) digits is 952560, while the sum is 51.

The spelling of 21975900378 in words is "twenty-one billion, nine hundred seventy-five million, nine hundred thousand, three hundred seventy-eight".