21361673675 has 6 divisors (see below), whose sum is σ = 26488475388. Its totient is φ = 17089338920.

The previous prime is 21361673651. The next prime is 21361673677. The reversal of 21361673675 is 57637616312.

It is not a de Polignac number, because 21361673675 - 2¹⁸ = 21361411531 is a prime.

It is a super-2 number, since 2×21361673675² (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 (21361673677) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 427233449 + ... + 427233498.

It is an arithmetic number, because the mean of its divisors is an integer number (4414745898).

Almost surely, 2^21361673675 is an apocalyptic number.

21361673675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21361673675 is a deficient number, since it is larger than the sum of its proper divisors (5126801713).

21361673675 is an equidigital number, since it uses as much as digits as its factorization.

21361673675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854466957 (or 854466952 counting only the distinct ones).

The product of its digits is 952560, while the sum is 47.

The spelling of 21361673675 in words is "twenty-one billion, three hundred sixty-one million, six hundred seventy-three thousand, six hundred seventy-five".