21035453125 has 28 divisors (see below), whose sum is σ = 26352084564. Its totient is φ = 16791200000.

The previous prime is 21035453123. The next prime is 21035453213. The reversal of 21035453125 is 52135453012.

It can be written as a sum of positive squares in 14 ways, for example, as 18469625409 + 2565827716 = 135903^2 + 50654^2 .

It is not a de Polignac number, because 21035453125 - 2¹ = 21035453123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21035453123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 8701917 + ... + 8704333.

Almost surely, 2^21035453125 is an apocalyptic number.

21035453125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21035453125 is a deficient number, since it is larger than the sum of its proper divisors (5316631439).

21035453125 is an frugal number, since it uses more digits than its factorization.

21035453125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3004 (or 2979 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21035453125 in words is "twenty-one billion, thirty-five million, four hundred fifty-three thousand, one hundred twenty-five".