12261921 has 32 divisors (see below), whose sum is σ = 19906560. Its totient is φ = 6561984.

The previous prime is 12261919. The next prime is 12261941. The reversal of 12261921 is 12916221.

It is not a de Polignac number, because 12261921 - 2¹ = 12261919 is a prime.

It is a super-2 number, since 2×12261921² = 300709413220482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12261891 and 12261900.

It is not an unprimeable number, because it can be changed into a prime (12261901) 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, 25360 + ... + 25838.

It is an arithmetic number, because the mean of its divisors is an integer number (622080).

Almost surely, 2^12261921 is an apocalyptic number.

It is an amenable number.

12261921 is a deficient number, since it is larger than the sum of its proper divisors (7644639).

12261921 is a wasteful number, since it uses less digits than its factorization.

12261921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 565.

The product of its digits is 432, while the sum is 24.

The square root of 12261921 is about 3501.7025858859. The cubic root of 12261921 is about 230.5965672456.

The spelling of 12261921 in words is "twelve million, two hundred sixty-one thousand, nine hundred twenty-one".