21296975730 has 16 divisors (see below), whose sum is σ = 51112741824. Its totient is φ = 5679193520.

The previous prime is 21296975723. The next prime is 21296975737. The reversal of 21296975730 is 3757969212.

It is an interprime number because it is at equal distance from previous prime (21296975723) and next prime (21296975737).

It is a super-2 number, since 2×21296975730² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21296975737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 354949566 + ... + 354949625.

It is an arithmetic number, because the mean of its divisors is an integer number (3194546364).

Almost surely, 2^21296975730 is an apocalyptic number.

21296975730 is an abundant number, since it is smaller than the sum of its proper divisors (29815766094).

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

21296975730 is a wasteful number, since it uses less digits than its factorization.

21296975730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 709899201.

The product of its (nonzero) digits is 1428840, while the sum is 51.

The spelling of 21296975730 in words is "twenty-one billion, two hundred ninety-six million, nine hundred seventy-five thousand, seven hundred thirty".