12057921 has 12 divisors (see below), whose sum is σ = 17656548. Its totient is φ = 7928064.

The previous prime is 12057919. The next prime is 12057949. The reversal of 12057921 is 12975021.

It can be written as a sum of positive squares in 2 ways, for example, as 2822400 + 9235521 = 1680^2 + 3039^2 .

It is not a de Polignac number, because 12057921 - 2¹ = 12057919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12057121) 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, 8520 + ... + 9833.

It is an arithmetic number, because the mean of its divisors is an integer number (1471379).

Almost surely, 2^12057921 is an apocalyptic number.

It is an amenable number.

12057921 is a deficient number, since it is larger than the sum of its proper divisors (5598627).

12057921 is a wasteful number, since it uses less digits than its factorization.

12057921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18432 (or 18429 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 12057921 is about 3472.4517275262. The cubic root of 12057921 is about 229.3106074150.

The spelling of 12057921 in words is "twelve million, fifty-seven thousand, nine hundred twenty-one".