21113644623 has 8 divisors (see below), whose sum is σ = 28424842368. Its totient is φ = 13939104984.

The previous prime is 21113644553. The next prime is 21113644661. The reversal of 21113644623 is 32644631112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21113644623 - 2⁸ = 21113644367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113644423) 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 7 ways as a sum of consecutive naturals, for example, 34164165 + ... + 34164782.

It is an arithmetic number, because the mean of its divisors is an integer number (3553105296).

Almost surely, 2^21113644623 is an apocalyptic number.

21113644623 is a deficient number, since it is larger than the sum of its proper divisors (7311197745).

21113644623 is a wasteful number, since it uses less digits than its factorization.

21113644623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68329053.

The product of its digits is 20736, while the sum is 33.

The spelling of 21113644623 in words is "twenty-one billion, one hundred thirteen million, six hundred forty-four thousand, six hundred twenty-three".