21261700675 has 12 divisors (see below), whose sum is σ = 27915362856. Its totient is φ = 16008809600.

The previous prime is 21261700673. The next prime is 21261700693. The reversal of 21261700675 is 57600716212.

It is not a de Polignac number, because 21261700675 - 2¹ = 21261700673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21261700673) 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 11 ways as a sum of consecutive naturals, for example, 25013341 + ... + 25014190.

It is an arithmetic number, because the mean of its divisors is an integer number (2326280238).

Almost surely, 2^21261700675 is an apocalyptic number.

21261700675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21261700675 is a deficient number, since it is larger than the sum of its proper divisors (6653662181).

21261700675 is a wasteful number, since it uses less digits than its factorization.

21261700675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50027558 (or 50027553 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 37.

The spelling of 21261700675 in words is "twenty-one billion, two hundred sixty-one million, seven hundred thousand, six hundred seventy-five".