13221953 has 2 divisors, whose sum is σ = 13221954. Its totient is φ = 13221952.

The previous prime is 13221947. The next prime is 13221977. The reversal of 13221953 is 35912231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8456464 + 4765489 = 2908^2 + 2183^2 .

It is a cyclic number.

It is not a de Polignac number, because 13221953 - 2⁸ = 13221697 is a prime.

It is a super-2 number, since 2×13221953² = 349640082268418, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13221353) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610976 + 6610977.

It is an arithmetic number, because the mean of its divisors is an integer number (6610977).

Almost surely, 2^13221953 is an apocalyptic number.

It is an amenable number.

13221953 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221953 is an equidigital number, since it uses as much as digits as its factorization.

13221953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1620, while the sum is 26.

The square root of 13221953 is about 3636.2003520158. The cubic root of 13221953 is about 236.4640932276.

The spelling of 13221953 in words is "thirteen million, two hundred twenty-one thousand, nine hundred fifty-three".