18253588921 has 4 divisors (see below), whose sum is σ = 18253894032. Its totient is φ = 18253283812.

The previous prime is 18253588909. The next prime is 18253588931. The reversal of 18253588921 is 12988535281.

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 18253588921 - 2¹³ = 18253580729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18253588901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29995 + ... + 193408.

It is an arithmetic number, because the mean of its divisors is an integer number (4563473508).

Almost surely, 2^18253588921 is an apocalyptic number.

It is an amenable number.

18253588921 is a deficient number, since it is larger than the sum of its proper divisors (305111).

18253588921 is an equidigital number, since it uses as much as digits as its factorization.

18253588921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305110.

The product of its digits is 1382400, while the sum is 52.

The spelling of 18253588921 in words is "eighteen billion, two hundred fifty-three million, five hundred eighty-eight thousand, nine hundred twenty-one".