21159609888 has 48 divisors (see below), whose sum is σ = 56093942016. Its totient is φ = 6983366400.

The previous prime is 21159609883. The next prime is 21159610001. The reversal of 21159609888 is 88890695112.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×21159609888² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21159609881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1081456 + ... + 1100847.

It is an arithmetic number, because the mean of its divisors is an integer number (1168623792).

Almost surely, 2^21159609888 is an apocalyptic number.

It is an amenable number.

21159609888 is an abundant number, since it is smaller than the sum of its proper divisors (34934332128).

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

21159609888 is a wasteful number, since it uses less digits than its factorization.

21159609888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2182417 (or 2182409 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 57.

The spelling of 21159609888 in words is "twenty-one billion, one hundred fifty-nine million, six hundred nine thousand, eight hundred eighty-eight".