12290921 has 2 divisors, whose sum is σ = 12290922. Its totient is φ = 12290920.

The previous prime is 12290917. The next prime is 12290953. The reversal of 12290921 is 12909221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12075625 + 215296 = 3475^2 + 464^2 .

It is a cyclic number.

It is not a de Polignac number, because 12290921 - 2² = 12290917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12290981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6145460 + 6145461.

It is an arithmetic number, because the mean of its divisors is an integer number (6145461).

Almost surely, 2^12290921 is an apocalyptic number.

It is an amenable number.

12290921 is a deficient number, since it is larger than the sum of its proper divisors (1).

12290921 is an equidigital number, since it uses as much as digits as its factorization.

12290921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 12290921 is about 3505.8409832735. The cubic root of 12290921 is about 230.7782145705.

It can be divided in two parts, 1 and 2290921, that added together give a palindrome (2290922).

The spelling of 12290921 in words is "twelve million, two hundred ninety thousand, nine hundred twenty-one".