21365880426 has 48 divisors (see below), whose sum is σ = 50524737120. Its totient is φ = 6471488160.

The previous prime is 21365880421. The next prime is 21365880439. The reversal of 21365880426 is 62408856312.

21365880426 is a `hidden beast` number, since 21 + 3 + 6 + 588 + 0 + 42 + 6 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21365880421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 420060 + ... + 468168.

It is an arithmetic number, because the mean of its divisors is an integer number (1052598690).

Almost surely, 2^21365880426 is an apocalyptic number.

21365880426 is an abundant number, since it is smaller than the sum of its proper divisors (29158856694).

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

21365880426 is a wasteful number, since it uses less digits than its factorization.

21365880426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50371 (or 50368 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 21365880426 in words is "twenty-one billion, three hundred sixty-five million, eight hundred eighty thousand, four hundred twenty-six".