21337772450 has 12 divisors (see below), whose sum is σ = 39688256850. Its totient is φ = 8535108960.

The previous prime is 21337772447. The next prime is 21337772527. The reversal of 21337772450 is 5427773312.

It can be written as a sum of positive squares in 3 ways, for example, as 18431592169 + 2906180281 = 135763^2 + 53909^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21337772398 and 21337772407.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213377675 + ... + 213377774.

Almost surely, 2^21337772450 is an apocalyptic number.

21337772450 is a deficient number, since it is larger than the sum of its proper divisors (18350484400).

21337772450 is a wasteful number, since it uses less digits than its factorization.

21337772450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426755461 (or 426755456 counting only the distinct ones).

The product of its (nonzero) digits is 246960, while the sum is 41.

The spelling of 21337772450 in words is "twenty-one billion, three hundred thirty-seven million, seven hundred seventy-two thousand, four hundred fifty".