13402221 has 8 divisors (see below), whose sum is σ = 20422464. Its totient is φ = 7658400.

The previous prime is 13402189. The next prime is 13402223. The reversal of 13402221 is 12220431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13402221 - 2⁵ = 13402189 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13402221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13402223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319080 + ... + 319121.

It is an arithmetic number, because the mean of its divisors is an integer number (2552808).

Almost surely, 2^13402221 is an apocalyptic number.

It is an amenable number.

13402221 is a deficient number, since it is larger than the sum of its proper divisors (7020243).

13402221 is an equidigital number, since it uses as much as digits as its factorization.

13402221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638211.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 13402221 is about 3660.9043964572. The cubic root of 13402221 is about 237.5338958085.

Adding to 13402221 its reverse (12220431), we get a palindrome (25622652).

The spelling of 13402221 in words is "thirteen million, four hundred two thousand, two hundred twenty-one".