12240921 has 32 divisors (see below), whose sum is σ = 21427200. Its totient is φ = 6022080.

The previous prime is 12240913. The next prime is 12240937. The reversal of 12240921 is 12904221.

It is not a de Polignac number, because 12240921 - 2³ = 12240913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (12240911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2995 + ... + 5783.

It is an arithmetic number, because the mean of its divisors is an integer number (669600).

Almost surely, 2^12240921 is an apocalyptic number.

12240921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12240921 is a deficient number, since it is larger than the sum of its proper divisors (9186279).

12240921 is a wasteful number, since it uses less digits than its factorization.

12240921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2829.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 12240921 is about 3498.7027595953. The cubic root of 12240921 is about 230.4648506624.

The spelling of 12240921 in words is "twelve million, two hundred forty thousand, nine hundred twenty-one".