21940951488 has 28 divisors (see below), whose sum is σ = 58052101320. Its totient is φ = 7313650432.

The previous prime is 21940951397. The next prime is 21940951489. The reversal of 21940951488 is 88415904912.

It is a self number, because there is not a number n which added to its sum of digits gives 21940951488.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21940951489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57137703 + ... + 57138086.

Almost surely, 2^21940951488 is an apocalyptic number.

It is an amenable number.

21940951488 is an abundant number, since it is smaller than the sum of its proper divisors (36111149832).

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

21940951488 is a wasteful number, since it uses less digits than its factorization.

21940951488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114275804 (or 114275794 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 21940951488 in words is "twenty-one billion, nine hundred forty million, nine hundred fifty-one thousand, four hundred eighty-eight".