21102513000 has 64 divisors (see below), whose sum is σ = 65839849920. Its totient is φ = 5627336000.

The previous prime is 21102512989. The next prime is 21102513011. The reversal of 21102513000 is 31520112.

It is an interprime number because it is at equal distance from previous prime (21102512989) and next prime (21102513011).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3514086 + ... + 3520085.

It is an arithmetic number, because the mean of its divisors is an integer number (1028747655).

Almost surely, 2^21102513000 is an apocalyptic number.

21102513000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21102513000 is an abundant number, since it is smaller than the sum of its proper divisors (44737336920).

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

21102513000 is a wasteful number, since it uses less digits than its factorization.

21102513000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034195 (or 7034181 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 15.

The spelling of 21102513000 in words is "twenty-one billion, one hundred two million, five hundred thirteen thousand".