12618921 has 12 divisors (see below), whose sum is σ = 19572432. Its totient is φ = 7210728.

The previous prime is 12618911. The next prime is 12618937. The reversal of 12618921 is 12981621.

It is a happy number.

It is not a de Polignac number, because 12618921 - 2¹⁴ = 12602537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12618911) 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, 42775 + ... + 43068.

It is an arithmetic number, because the mean of its divisors is an integer number (1631036).

Almost surely, 2^12618921 is an apocalyptic number.

It is an amenable number.

12618921 is a deficient number, since it is larger than the sum of its proper divisors (6953511).

12618921 is an equidigital number, since it uses as much as digits as its factorization.

12618921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85860 (or 85853 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 12618921 is about 3552.3120639944. The cubic root of 12618921 is about 232.8130965046.

The spelling of 12618921 in words is "twelve million, six hundred eighteen thousand, nine hundred twenty-one".