18612121 has 8 divisors (see below), whose sum is σ = 20959488. Its totient is φ = 16374000.

The previous prime is 18612119. The next prime is 18612133. The reversal of 18612121 is 12121681.

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

It is a cyclic number.

It is not a de Polignac number, because 18612121 - 2¹ = 18612119 is a prime.

It is a super-3 number, since 3×18612121³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 18612092 and 18612101.

It is not an unprimeable number, because it can be changed into a prime (18612101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26950 + ... + 27631.

It is an arithmetic number, because the mean of its divisors is an integer number (2619936).

Almost surely, 2^18612121 is an apocalyptic number.

18612121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18612121 is a deficient number, since it is larger than the sum of its proper divisors (2347367).

18612121 is a wasteful number, since it uses less digits than its factorization.

18612121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54623.

The product of its digits is 192, while the sum is 22.

The square root of 18612121 is about 4314.1767464952. The cubic root of 18612121 is about 265.0118471030.

The spelling of 18612121 in words is "eighteen million, six hundred twelve thousand, one hundred twenty-one".