18555032121 has 8 divisors (see below), whose sum is σ = 25815696960. Its totient is φ = 11832194352.

The previous prime is 18555032117. The next prime is 18555032149. The reversal of 18555032121 is 12123055581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18555032121 - 2² = 18555032117 is a prime.

It is a super-2 number, since 2×18555032121² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18555032921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134456686 + ... + 134456823.

It is an arithmetic number, because the mean of its divisors is an integer number (3226962120).

Almost surely, 2^18555032121 is an apocalyptic number.

It is an amenable number.

18555032121 is a deficient number, since it is larger than the sum of its proper divisors (7260664839).

18555032121 is a wasteful number, since it uses less digits than its factorization.

18555032121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268913535.

The product of its (nonzero) digits is 12000, while the sum is 33.

The spelling of 18555032121 in words is "eighteen billion, five hundred fifty-five million, thirty-two thousand, one hundred twenty-one".