18152121 has 12 divisors (see below), whose sum is σ = 26208528. Its totient is φ = 11170224.

The previous prime is 18152111. The next prime is 18152131. The reversal of 18152121 is 12125181.

It is an interprime number because it is at equal distance from previous prime (18152111) and next prime (18152131).

It is not a de Polignac number, because 18152121 - 2⁷ = 18151993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18152111) 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, 17395 + ... + 18408.

It is an arithmetic number, because the mean of its divisors is an integer number (2184044).

Almost surely, 2^18152121 is an apocalyptic number.

It is an amenable number.

18152121 is a deficient number, since it is larger than the sum of its proper divisors (8056407).

18152121 is a wasteful number, since it uses less digits than its factorization.

18152121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35832 (or 35819 counting only the distinct ones).

The product of its digits is 160, while the sum is 21.

The square root of 18152121 is about 4260.5306007585. The cubic root of 18152121 is about 262.8103467729.

The spelling of 18152121 in words is "eighteen million, one hundred fifty-two thousand, one hundred twenty-one".