21451452858 has 64 divisors (see below), whose sum is σ = 52463894400. Its totient is φ = 6442894080.

The previous prime is 21451452857. The next prime is 21451452937. The reversal of 21451452858 is 85825415412.

21451452858 is a `hidden beast` number, since 2 + 1 + 4 + 514 + 52 + 85 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (21451452857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92673 + ... + 226916.

It is an arithmetic number, because the mean of its divisors is an integer number (819748350).

Almost surely, 2^21451452858 is an apocalyptic number.

21451452858 is an abundant number, since it is smaller than the sum of its proper divisors (31012441542).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21451452858 is a wasteful number, since it uses less digits than its factorization.

21451452858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319724 (or 319718 counting only the distinct ones).

The product of its digits is 512000, while the sum is 45.

The spelling of 21451452858 in words is "twenty-one billion, four hundred fifty-one million, four hundred fifty-two thousand, eight hundred fifty-eight".