23388715221 has 16 divisors (see below), whose sum is σ = 31987000320. Its totient is φ = 15196144320.

The previous prime is 23388715219. The next prime is 23388715237. The reversal of 23388715221 is 12251788332.

It is not a de Polignac number, because 23388715221 - 2¹ = 23388715219 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23388715211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566325 + ... + 606218.

It is an arithmetic number, because the mean of its divisors is an integer number (1999187520).

Almost surely, 2^23388715221 is an apocalyptic number.

It is an amenable number.

23388715221 is a deficient number, since it is larger than the sum of its proper divisors (8598285099).

23388715221 is a wasteful number, since it uses less digits than its factorization.

23388715221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1172716.

The product of its digits is 161280, while the sum is 42.

The spelling of 23388715221 in words is "twenty-three billion, three hundred eighty-eight million, seven hundred fifteen thousand, two hundred twenty-one".