12057021 has 6 divisors (see below), whose sum is σ = 17415710. Its totient is φ = 8038008.

The previous prime is 12057013. The next prime is 12057041. The reversal of 12057021 is 12075021.

It can be written as a sum of positive squares in only one way, i.e., 9922500 + 2134521 = 3150^2 + 1461^2 .

It is not a de Polignac number, because 12057021 - 2³ = 12057013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12056985 and 12057003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12057041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 669826 + ... + 669843.

Almost surely, 2^12057021 is an apocalyptic number.

It is an amenable number.

12057021 is a deficient number, since it is larger than the sum of its proper divisors (5358689).

12057021 is a wasteful number, since it uses less digits than its factorization.

12057021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1339675 (or 1339672 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 12057021 is about 3472.3221336737. The cubic root of 12057021 is about 229.3049020456.

The spelling of 12057021 in words is "twelve million, fifty-seven thousand, twenty-one".