21020500675 has 6 divisors (see below), whose sum is σ = 26065420868. Its totient is φ = 16816400520.

The previous prime is 21020500661. The next prime is 21020500681. The reversal of 21020500675 is 57600502012.

It is not a de Polignac number, because 21020500675 - 2⁷ = 21020500547 is a prime.

It is a super-2 number, since 2×21020500675² (a number of 21 digits) contains 22 as substring.

It is a Duffinian 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, 420409989 + ... + 420410038.

Almost surely, 2^21020500675 is an apocalyptic number.

21020500675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21020500675 is a deficient number, since it is larger than the sum of its proper divisors (5044920193).

21020500675 is an equidigital number, since it uses as much as digits as its factorization.

21020500675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840820037 (or 840820032 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The spelling of 21020500675 in words is "twenty-one billion, twenty million, five hundred thousand, six hundred seventy-five".