21203112888 has 24 divisors (see below), whose sum is σ = 57425097600. Its totient is φ = 7067704272.

The previous prime is 21203112869. The next prime is 21203112893. The reversal of 21203112888 is 88821130212.

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

It is a super-2 number, since 2×21203112888² (a number of 21 digits) contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 147243768 + ... + 147243911.

It is an arithmetic number, because the mean of its divisors is an integer number (2392712400).

Almost surely, 2^21203112888 is an apocalyptic number.

It is an amenable number.

21203112888 is an abundant number, since it is smaller than the sum of its proper divisors (36221984712).

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

21203112888 is a wasteful number, since it uses less digits than its factorization.

21203112888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294487691 (or 294487684 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The spelling of 21203112888 in words is "twenty-one billion, two hundred three million, one hundred twelve thousand, eight hundred eighty-eight".