21709095075 has 18 divisors (see below), whose sum is σ = 38883401804. Its totient is φ = 11578183920.

The previous prime is 21709095071. The next prime is 21709095097. The reversal of 21709095075 is 57059090712.

It is not a de Polignac number, because 21709095075 - 2² = 21709095071 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21709095075.

It is not an unprimeable number, because it can be changed into a prime (21709095071) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 48242209 + ... + 48242658.

Almost surely, 2^21709095075 is an apocalyptic number.

21709095075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21709095075 is a deficient number, since it is larger than the sum of its proper divisors (17174306729).

21709095075 is a wasteful number, since it uses less digits than its factorization.

21709095075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96484883 (or 96484875 counting only the distinct ones).

The product of its (nonzero) digits is 198450, while the sum is 45.

It can be divided in two parts, 2170 and 9095075, that added together give a triangular number (9097245 = T₄₂₆₅).

The spelling of 21709095075 in words is "twenty-one billion, seven hundred nine million, ninety-five thousand, seventy-five".