21337903873 has 32 divisors (see below), whose sum is σ = 26374908672. Its totient is φ = 17127095040.

The previous prime is 21337903831. The next prime is 21337903891. The reversal of 21337903873 is 37830973312.

It is not a de Polignac number, because 21337903873 - 2³³ = 12747969281 is a prime.

It is a super-2 number, since 2×21337903873² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21337903813) 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, 371161 + ... + 424777.

It is an arithmetic number, because the mean of its divisors is an integer number (824215896).

Almost surely, 2^21337903873 is an apocalyptic number.

21337903873 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21337903873 is a deficient number, since it is larger than the sum of its proper divisors (5037004799).

21337903873 is a wasteful number, since it uses less digits than its factorization.

21337903873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53686 (or 53664 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 46.

The spelling of 21337903873 in words is "twenty-one billion, three hundred thirty-seven million, nine hundred three thousand, eight hundred seventy-three".