21674633621 has 16 divisors (see below), whose sum is σ = 22413093120. Its totient is φ = 20947476480.

The previous prime is 21674633573. The next prime is 21674633683. The reversal of 21674633621 is 12633647612.

It is a cyclic number.

It is not a de Polignac number, because 21674633621 - 2⁶ = 21674633557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674633221) 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 15 ways as a sum of consecutive naturals, for example, 3111140 + ... + 3118098.

It is an arithmetic number, because the mean of its divisors is an integer number (1400818320).

Almost surely, 2^21674633621 is an apocalyptic number.

It is an amenable number.

21674633621 is a deficient number, since it is larger than the sum of its proper divisors (738459499).

21674633621 is a wasteful number, since it uses less digits than its factorization.

21674633621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756.

The product of its digits is 217728, while the sum is 41.

The spelling of 21674633621 in words is "twenty-one billion, six hundred seventy-four million, six hundred thirty-three thousand, six hundred twenty-one".