18002932121 has 4 divisors (see below), whose sum is σ = 18489497892. Its totient is φ = 17516366352.

The previous prime is 18002932111. The next prime is 18002932133. The reversal of 18002932121 is 12123920081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15400810000 + 2602122121 = 124100^2 + 51011^2 .

It is a cyclic number.

It is not a de Polignac number, because 18002932121 - 2¹⁸ = 18002669977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18002932111) 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, 243282830 + ... + 243282903.

It is an arithmetic number, because the mean of its divisors is an integer number (4622374473).

Almost surely, 2^18002932121 is an apocalyptic number.

It is an amenable number.

18002932121 is a deficient number, since it is larger than the sum of its proper divisors (486565771).

18002932121 is an equidigital number, since it uses as much as digits as its factorization.

18002932121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486565770.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 18002932121 in words is "eighteen billion, two million, nine hundred thirty-two thousand, one hundred twenty-one".