21500451134325 has 36 divisors (see below), whose sum is σ = 39935982003008. Its totient is φ = 11466907268400.

The previous prime is 21500451134297. The next prime is 21500451134347. The reversal of 21500451134325 is 52343115400512.

21500451134325 is a `hidden beast` number, since 2 + 1 + 50 + 0 + 451 + 134 + 3 + 25 = 666.

It is not a de Polignac number, because 21500451134325 - 2⁸ = 21500451134069 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21500451134325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1769578381 + ... + 1769590530.

Almost surely, 2^{21500451134325} is an apocalyptic number.

21500451134325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21500451134325 is a deficient number, since it is larger than the sum of its proper divisors (18435530868683).

21500451134325 is an equidigital number, since it uses as much as digits as its factorization.

21500451134325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3539168936 (or 3539168919 counting only the distinct ones).

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

Adding to 21500451134325 its reverse (52343115400512), we get a palindrome (73843566534837).

The spelling of 21500451134325 in words is "twenty-one trillion, five hundred billion, four hundred fifty-one million, one hundred thirty-four thousand, three hundred twenty-five".