21735019875 has 32 divisors (see below), whose sum is σ = 36208860480. Its totient is φ = 11578617600.

The previous prime is 21735019837. The next prime is 21735019883. The reversal of 21735019875 is 57891053712.

It is not a de Polignac number, because 21735019875 - 2⁹ = 21735019363 is a prime.

It is a super-2 number, since 2×21735019875² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 295831 + ... + 361919.

It is an arithmetic number, because the mean of its divisors is an integer number (1131526890).

Almost surely, 2^21735019875 is an apocalyptic number.

21735019875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21735019875 is a deficient number, since it is larger than the sum of its proper divisors (14473840605).

21735019875 is an equidigital number, since it uses as much as digits as its factorization.

21735019875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66984 (or 66974 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 48.

The spelling of 21735019875 in words is "twenty-one billion, seven hundred thirty-five million, nineteen thousand, eight hundred seventy-five".