21628772450 has 12 divisors (see below), whose sum is σ = 40229516850. Its totient is φ = 8651508960.

The previous prime is 21628772437. The next prime is 21628772471. The reversal of 21628772450 is 5427782612.

It can be written as a sum of positive squares in 3 ways, for example, as 20808351001 + 820421449 = 144251^2 + 28643^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216287675 + ... + 216287774.

Almost surely, 2^21628772450 is an apocalyptic number.

21628772450 is a deficient number, since it is larger than the sum of its proper divisors (18600744400).

21628772450 is a wasteful number, since it uses less digits than its factorization.

21628772450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432575461 (or 432575456 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 44.

The spelling of 21628772450 in words is "twenty-one billion, six hundred twenty-eight million, seven hundred seventy-two thousand, four hundred fifty".