23659929621 has 6 divisors (see below), whose sum is σ = 34175453910. Its totient is φ = 15773286408.

The previous prime is 23659929599. The next prime is 23659929649. The reversal of 23659929621 is 12692995632.

It is a happy number.

23659929621 is a `hidden beast` number, since 2 + 3 + 6 + 5 + 9 + 9 + 2 + 9 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 17686340100 + 5973589521 = 132990^2 + 77289^2 .

It is not a de Polignac number, because 23659929621 - 2¹⁰ = 23659928597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23659924621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1314440526 + ... + 1314440543.

It is an arithmetic number, because the mean of its divisors is an integer number (5695908985).

Almost surely, 2^23659929621 is an apocalyptic number.

It is an amenable number.

23659929621 is a deficient number, since it is larger than the sum of its proper divisors (10515524289).

23659929621 is a wasteful number, since it uses less digits than its factorization.

23659929621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2628881075 (or 2628881072 counting only the distinct ones).

The product of its digits is 3149280, while the sum is 54.

The spelling of 23659929621 in words is "twenty-three billion, six hundred fifty-nine million, nine hundred twenty-nine thousand, six hundred twenty-one".