18011032121 has 16 divisors (see below), whose sum is σ = 19366905600. Its totient is φ = 16699800528.

The previous prime is 18011032079. The next prime is 18011032133. The reversal of 18011032121 is 12123011081.

It is a happy number.

It is not a de Polignac number, because 18011032121 - 2²² = 18006837817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18011032093 and 18011032102.

It is not an unprimeable number, because it can be changed into a prime (18011032141) 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, 115370 + ... + 222108.

It is an arithmetic number, because the mean of its divisors is an integer number (1210431600).

Almost surely, 2^18011032121 is an apocalyptic number.

It is an amenable number.

18011032121 is a deficient number, since it is larger than the sum of its proper divisors (1355873479).

18011032121 is a wasteful number, since it uses less digits than its factorization.

18011032121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106948.

The product of its (nonzero) digits is 96, while the sum is 20.

The spelling of 18011032121 in words is "eighteen billion, eleven million, thirty-two thousand, one hundred twenty-one".