21124545453 has 24 divisors (see below), whose sum is σ = 33305628096. Its totient is φ = 12795652800.

The previous prime is 21124545391. The next prime is 21124545461. The reversal of 21124545453 is 35454542112.

21124545453 is a `hidden beast` number, since 2 + 112 + 45 + 454 + 53 = 666.

It is not a de Polignac number, because 21124545453 - 2¹⁰ = 21124544429 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21124545493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 123001 + ... + 239537.

It is an arithmetic number, because the mean of its divisors is an integer number (1387734504).

Almost surely, 2^21124545453 is an apocalyptic number.

It is an amenable number.

21124545453 is a deficient number, since it is larger than the sum of its proper divisors (12181082643).

21124545453 is a wasteful number, since it uses less digits than its factorization.

21124545453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118385 (or 118382 counting only the distinct ones).

The product of its digits is 96000, while the sum is 36.

The spelling of 21124545453 in words is "twenty-one billion, one hundred twenty-four million, five hundred forty-five thousand, four hundred fifty-three".