18339225921 has 12 divisors (see below), whose sum is σ = 26692208400. Its totient is φ = 12132820440.

The previous prime is 18339225917. The next prime is 18339225967. The reversal of 18339225921 is 12952293381.

18339225921 is a `hidden beast` number, since 1 + 8 + 3 + 39 + 22 + 592 + 1 = 666.

It is not a de Polignac number, because 18339225921 - 2² = 18339225917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18339225901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7776271 + ... + 7778628.

It is an arithmetic number, because the mean of its divisors is an integer number (2224350700).

Almost surely, 2^18339225921 is an apocalyptic number.

It is an amenable number.

18339225921 is a deficient number, since it is larger than the sum of its proper divisors (8352982479).

18339225921 is a wasteful number, since it uses less digits than its factorization.

18339225921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15555036 (or 15555033 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 18339225921 in words is "eighteen billion, three hundred thirty-nine million, two hundred twenty-five thousand, nine hundred twenty-one".