13098221 has 4 divisors (see below), whose sum is σ = 13131612. Its totient is φ = 13064832.

The previous prime is 13098167. The next prime is 13098223. The reversal of 13098221 is 12289031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12289031 = 89 ⋅138079.

It can be written as a sum of positive squares in 2 ways, for example, as 4182025 + 8916196 = 2045^2 + 2986^2 .

It is a cyclic number.

It is not a de Polignac number, because 13098221 - 2⁶ = 13098157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13098223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16100 + ... + 16893.

It is an arithmetic number, because the mean of its divisors is an integer number (3282903).

Almost surely, 2^13098221 is an apocalyptic number.

It is an amenable number.

13098221 is a deficient number, since it is larger than the sum of its proper divisors (33391).

13098221 is an equidigital number, since it uses as much as digits as its factorization.

13098221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33390.

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

The square root of 13098221 is about 3619.1464463323. The cubic root of 13098221 is about 235.7241642281.

The spelling of 13098221 in words is "thirteen million, ninety-eight thousand, two hundred twenty-one".