13089221 has 2 divisors, whose sum is σ = 13089222. Its totient is φ = 13089220.

The previous prime is 13089217. The next prime is 13089229. The reversal of 13089221 is 12298031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 57121 = 3610^2 + 239^2 .

It is a cyclic number.

It is not a de Polignac number, because 13089221 - 2² = 13089217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13089229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6544610 + 6544611.

It is an arithmetic number, because the mean of its divisors is an integer number (6544611).

Almost surely, 2^13089221 is an apocalyptic number.

It is an amenable number.

13089221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13089221 is an equidigital number, since it uses as much as digits as its factorization.

13089221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 13089221 is about 3617.9028455723. The cubic root of 13089221 is about 235.6701618926.

The spelling of 13089221 in words is "thirteen million, eighty-nine thousand, two hundred twenty-one".