13220997 has 4 divisors (see below), whose sum is σ = 17628000. Its totient is φ = 8813996.

The previous prime is 13220993. The next prime is 13221007. The reversal of 13220997 is 79902231.

13220997 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79902231 = 3 ⋅26634077.

It is a cyclic number.

It is not a de Polignac number, because 13220997 - 2² = 13220993 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13220993) 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, 2203497 + ... + 2203502.

It is an arithmetic number, because the mean of its divisors is an integer number (4407000).

Almost surely, 2^13220997 is an apocalyptic number.

It is an amenable number.

13220997 is a deficient number, since it is larger than the sum of its proper divisors (4407003).

13220997 is an equidigital number, since it uses as much as digits as its factorization.

13220997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4407002.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 13220997 is about 3636.0688937368. The cubic root of 13220997 is about 236.4583939909.

The spelling of 13220997 in words is "thirteen million, two hundred twenty thousand, nine hundred ninety-seven".