21868953888 has 24 divisors (see below), whose sum is σ = 57406004208. Its totient is φ = 7289651264.

The previous prime is 21868953871. The next prime is 21868953893. The reversal of 21868953888 is 88835986812.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21868953888² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113900706 + ... + 113900897.

It is an arithmetic number, because the mean of its divisors is an integer number (2391916842).

Almost surely, 2^21868953888 is an apocalyptic number.

It is an amenable number.

21868953888 is an abundant number, since it is smaller than the sum of its proper divisors (35537050320).

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

21868953888 is a wasteful number, since it uses less digits than its factorization.

21868953888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227801616 (or 227801608 counting only the distinct ones).

The product of its digits is 53084160, while the sum is 66.

The spelling of 21868953888 in words is "twenty-one billion, eight hundred sixty-eight million, nine hundred fifty-three thousand, eight hundred eighty-eight".