21010514688 has 54 divisors (see below), whose sum is σ = 60578500164. Its totient is φ = 7003504128.

The previous prime is 21010514671. The next prime is 21010514729. The reversal of 21010514688 is 88641501012.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4557270 + ... + 4561877.

Almost surely, 2^21010514688 is an apocalyptic number.

It is an amenable number.

21010514688 is an abundant number, since it is smaller than the sum of its proper divisors (39567985476).

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

21010514688 is an equidigital number, since it uses as much as digits as its factorization.

21010514688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9119169 (or 9119152 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The spelling of 21010514688 in words is "twenty-one billion, ten million, five hundred fourteen thousand, six hundred eighty-eight".