21020595075 has 36 divisors (see below), whose sum is σ = 38212192408. Its totient is φ = 11043648000.

The previous prime is 21020595073. The next prime is 21020595131. The reversal of 21020595075 is 57059502012.

It is not a de Polignac number, because 21020595075 - 2¹ = 21020595073 is a prime.

It is a super-2 number, since 2×21020595075² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21020595073) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 682126 + ... + 712275.

Almost surely, 2^21020595075 is an apocalyptic number.

21020595075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21020595075 is a deficient number, since it is larger than the sum of its proper divisors (17191597333).

21020595075 is a wasteful number, since it uses less digits than its factorization.

21020595075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394484 (or 1394476 counting only the distinct ones).

The product of its (nonzero) digits is 31500, while the sum is 36.

The spelling of 21020595075 in words is "twenty-one billion, twenty million, five hundred ninety-five thousand, seventy-five".