21112703240 has 32 divisors (see below), whose sum is σ = 50297912280. Its totient is φ = 7948311552.

The previous prime is 21112703179. The next prime is 21112703321. The reversal of 21112703240 is 4230721112.

It can be written as a sum of positive squares in 4 ways, for example, as 21104535076 + 8168164 = 145274^2 + 2858^2 .

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, 15523367 + ... + 15524726.

Almost surely, 2^21112703240 is an apocalyptic number.

21112703240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112703240 is an abundant number, since it is smaller than the sum of its proper divisors (29185209040).

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

21112703240 is a wasteful number, since it uses less digits than its factorization.

21112703240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31048121 (or 31048117 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The spelling of 21112703240 in words is "twenty-one billion, one hundred twelve million, seven hundred three thousand, two hundred forty".