21450316455 has 32 divisors (see below), whose sum is σ = 38139990720. Its totient is φ = 11438340480.

The previous prime is 21450316427. The next prime is 21450316469. The reversal of 21450316455 is 55461305412.

21450316455 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 0 + 3 + 1 + 645 + 5 = 666.

It is not a de Polignac number, because 21450316455 - 2¹⁶ = 21450250919 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1501245 + ... + 1515465.

It is an arithmetic number, because the mean of its divisors is an integer number (1191874710).

Almost surely, 2^21450316455 is an apocalyptic number.

21450316455 is a deficient number, since it is larger than the sum of its proper divisors (16689674265).

21450316455 is a wasteful number, since it uses less digits than its factorization.

21450316455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25408 (or 25402 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 36.

The spelling of 21450316455 in words is "twenty-one billion, four hundred fifty million, three hundred sixteen thousand, four hundred fifty-five".