21296945786816 has 28 divisors (see below), whose sum is σ = 48298430624688. Its totient is φ = 9127262479872.

The previous prime is 21296945786761. The next prime is 21296945786819. The reversal of 21296945786816 is 61868754969212.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21296945786819) 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, 23768912261 + ... + 23768913156.

Almost surely, 2^{21296945786816} is an apocalyptic number.

It is an amenable number.

21296945786816 is an abundant number, since it is smaller than the sum of its proper divisors (27001484837872).

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

21296945786816 is an equidigital number, since it uses as much as digits as its factorization.

21296945786816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47537825436 (or 47537825426 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 74.

The spelling of 21296945786816 in words is "twenty-one trillion, two hundred ninety-six billion, nine hundred forty-five million, seven hundred eighty-six thousand, eight hundred sixteen".