21695750079 has 4 divisors (see below), whose sum is σ = 28927666776. Its totient is φ = 14463833384.

The previous prime is 21695750071. The next prime is 21695750099. The reversal of 21695750079 is 97005759612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21695750079 - 2³ = 21695750071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21695750071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3615958344 + ... + 3615958349.

It is an arithmetic number, because the mean of its divisors is an integer number (7231916694).

Almost surely, 2^21695750079 is an apocalyptic number.

21695750079 is a deficient number, since it is larger than the sum of its proper divisors (7231916697).

21695750079 is an equidigital number, since it uses as much as digits as its factorization.

21695750079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7231916696.

The product of its (nonzero) digits is 1190700, while the sum is 51.

The spelling of 21695750079 in words is "twenty-one billion, six hundred ninety-five million, seven hundred fifty thousand, seventy-nine".