23520421993 has 4 divisors (see below), whose sum is σ = 24758338960. Its totient is φ = 22282505028.

The previous prime is 23520421973. The next prime is 23520422033. The reversal of 23520421993 is 39912402532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23520421993 - 2⁹ = 23520421481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23520421963) 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 3 ways as a sum of consecutive naturals, for example, 618958455 + ... + 618958492.

It is an arithmetic number, because the mean of its divisors is an integer number (6189584740).

Almost surely, 2^23520421993 is an apocalyptic number.

It is an amenable number.

23520421993 is a deficient number, since it is larger than the sum of its proper divisors (1237916967).

23520421993 is a wasteful number, since it uses less digits than its factorization.

23520421993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1237916966.

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 23520421993 in words is "twenty-three billion, five hundred twenty million, four hundred twenty-one thousand, nine hundred ninety-three".