21331837475 has 24 divisors (see below), whose sum is σ = 28498561392. Its totient is φ = 15745910400.

The previous prime is 21331837451. The next prime is 21331837489. The reversal of 21331837475 is 57473813312.

It is a happy number.

It is not a de Polignac number, because 21331837475 - 2³⁰ = 20258095651 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 809609 + ... + 835541.

It is an arithmetic number, because the mean of its divisors is an integer number (1187440058).

Almost surely, 2^21331837475 is an apocalyptic number.

21331837475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21331837475 is a deficient number, since it is larger than the sum of its proper divisors (7166723917).

21331837475 is a wasteful number, since it uses less digits than its factorization.

21331837475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28487 (or 28482 counting only the distinct ones).

The product of its digits is 423360, while the sum is 44.

The spelling of 21331837475 in words is "twenty-one billion, three hundred thirty-one million, eight hundred thirty-seven thousand, four hundred seventy-five".