13221879 has 16 divisors (see below), whose sum is σ = 19319040. Its totient is φ = 7976960.

The previous prime is 13221877. The next prime is 13221881. The reversal of 13221879 is 97812231.

It is an interprime number because it is at equal distance from previous prime (13221877) and next prime (13221881).

It is a cyclic number.

It is not a de Polignac number, because 13221879 - 2¹ = 13221877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7702 + ... + 9260.

It is an arithmetic number, because the mean of its divisors is an integer number (1207440).

Almost surely, 2^13221879 is an apocalyptic number.

13221879 is a deficient number, since it is larger than the sum of its proper divisors (6097161).

13221879 is a wasteful number, since it uses less digits than its factorization.

13221879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1830.

The product of its digits is 6048, while the sum is 33.

The square root of 13221879 is about 3636.1901765447. The cubic root of 13221879 is about 236.4636520831.

The spelling of 13221879 in words is "thirteen million, two hundred twenty-one thousand, eight hundred seventy-nine".