18502121 has 8 divisors (see below), whose sum is σ = 20412000. Its totient is φ = 16630240.

The previous prime is 18502079. The next prime is 18502123. The reversal of 18502121 is 12120581.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-18502121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18502093 and 18502102.

It is not an unprimeable number, because it can be changed into a prime (18502123) 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, 8471 + ... + 10428.

It is an arithmetic number, because the mean of its divisors is an integer number (2551500).

Almost surely, 2^18502121 is an apocalyptic number.

18502121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18502121 is a deficient number, since it is larger than the sum of its proper divisors (1909879).

18502121 is a wasteful number, since it uses less digits than its factorization.

18502121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18999.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 18502121 is about 4301.4091876965. The cubic root of 18502121 is about 264.4887306207.

The spelling of 18502121 in words is "eighteen million, five hundred two thousand, one hundred twenty-one".