21458051876 has 12 divisors (see below), whose sum is σ = 38566498908. Its totient is φ = 10439052192.

The previous prime is 21458051873. The next prime is 21458051897. The reversal of 21458051876 is 67815085412.

It can be written as a sum of positive squares in 2 ways, for example, as 20858291776 + 599760100 = 144424^2 + 24490^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21458051876.

It is not an unprimeable number, because it can be changed into a prime (21458051873) 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 3 ways as a sum of consecutive naturals, for example, 72493271 + ... + 72493566.

It is an arithmetic number, because the mean of its divisors is an integer number (3213874909).

Almost surely, 2^21458051876 is an apocalyptic number.

It is an amenable number.

21458051876 is a deficient number, since it is larger than the sum of its proper divisors (17108447032).

21458051876 is a wasteful number, since it uses less digits than its factorization.

21458051876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144986878 (or 144986876 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 47.

The spelling of 21458051876 in words is "twenty-one billion, four hundred fifty-eight million, fifty-one thousand, eight hundred seventy-six".