21590103788 has 24 divisors (see below), whose sum is σ = 43386813120. Its totient is φ = 9297173520.

The previous prime is 21590103763. The next prime is 21590103827. The reversal of 21590103788 is 88730109512.

It is a super-2 number, since 2×21590103788² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12911906 + ... + 12913577.

It is an arithmetic number, because the mean of its divisors is an integer number (1807783880).

Almost surely, 2^21590103788 is an apocalyptic number.

It is an amenable number.

21590103788 is an abundant number, since it is smaller than the sum of its proper divisors (21796709332).

21590103788 is a wasteful number, since it uses less digits than its factorization.

21590103788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25825517 (or 25825515 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 44.

The spelling of 21590103788 in words is "twenty-one billion, five hundred ninety million, one hundred three thousand, seven hundred eighty-eight".