21365031676424 has 48 divisors (see below), whose sum is σ = 41191717940100. Its totient is φ = 10388665767168.

The previous prime is 21365031676381. The next prime is 21365031676433. The reversal of 21365031676424 is 42467613056312.

It can be written as a sum of positive squares in 6 ways, for example, as 21244079356900 + 120952319524 = 4609130^2 + 347782^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21740882 + ... + 22702334.

Almost surely, 2^{21365031676424} is an apocalyptic number.

It is an amenable number.

21365031676424 is a deficient number, since it is larger than the sum of its proper divisors (19826686263676).

21365031676424 is a wasteful number, since it uses less digits than its factorization.

21365031676424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 963562 (or 963521 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 21365031676424 in words is "twenty-one trillion, three hundred sixty-five billion, thirty-one million, six hundred seventy-six thousand, four hundred twenty-four".