12921089 has 2 divisors, whose sum is σ = 12921090. Its totient is φ = 12921088.

The previous prime is 12921061. The next prime is 12921091. The reversal of 12921089 is 98012921.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 984064 = 3455^2 + 992^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12921089 is a prime.

Together with 12921091, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12921049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6460544 + 6460545.

It is an arithmetic number, because the mean of its divisors is an integer number (6460545).

Almost surely, 2^12921089 is an apocalyptic number.

It is an amenable number.

12921089 is a deficient number, since it is larger than the sum of its proper divisors (1).

12921089 is an equidigital number, since it uses as much as digits as its factorization.

12921089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 12921089 is about 3594.5916318825. The cubic root of 12921089 is about 234.6567434663.

The spelling of 12921089 in words is "twelve million, nine hundred twenty-one thousand, eighty-nine".