23127291921 has 16 divisors (see below), whose sum is σ = 30903776640. Its totient is φ = 15384539520.

The previous prime is 23127291919. The next prime is 23127292061. The reversal of 23127291921 is 12919272132.

It is a happy number.

It is not a de Polignac number, because 23127291921 - 2¹ = 23127291919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23127291921.

It is not an unprimeable number, because it can be changed into a prime (23127291911) 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, 3054981 + ... + 3062541.

It is an arithmetic number, because the mean of its divisors is an integer number (1931486040).

Almost surely, 2^23127291921 is an apocalyptic number.

It is an amenable number.

23127291921 is a deficient number, since it is larger than the sum of its proper divisors (7776484719).

23127291921 is a wasteful number, since it uses less digits than its factorization.

23127291921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9656.

The product of its digits is 27216, while the sum is 39.

The spelling of 23127291921 in words is "twenty-three billion, one hundred twenty-seven million, two hundred ninety-one thousand, nine hundred twenty-one".