21275056873 has 16 divisors (see below), whose sum is σ = 24436249344. Its totient is φ = 18144552960.

The previous prime is 21275056769. The next prime is 21275056877. The reversal of 21275056873 is 37865057212.

It is a cyclic number.

It is not a de Polignac number, because 21275056873 - 2¹³ = 21275048681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21275056877) 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 15 ways as a sum of consecutive naturals, for example, 1247661 + ... + 1264597.

It is an arithmetic number, because the mean of its divisors is an integer number (1527265584).

Almost surely, 2^21275056873 is an apocalyptic number.

It is an amenable number.

21275056873 is a deficient number, since it is larger than the sum of its proper divisors (3161192471).

21275056873 is a wasteful number, since it uses less digits than its factorization.

21275056873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17832.

The product of its (nonzero) digits is 705600, while the sum is 46.

The spelling of 21275056873 in words is "twenty-one billion, two hundred seventy-five million, fifty-six thousand, eight hundred seventy-three".