13746221 has 4 divisors (see below), whose sum is σ = 13798752. Its totient is φ = 13693692.

The previous prime is 13746209. The next prime is 13746247. The reversal of 13746221 is 12264731.

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: 12264731 = 241 ⋅50891.

It is a cyclic number.

It is not a de Polignac number, because 13746221 - 2²² = 9551917 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 (13746281) 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, 25871 + ... + 26396.

It is an arithmetic number, because the mean of its divisors is an integer number (3449688).

Almost surely, 2^13746221 is an apocalyptic number.

It is an amenable number.

13746221 is a deficient number, since it is larger than the sum of its proper divisors (52531).

13746221 is an equidigital number, since it uses as much as digits as its factorization.

13746221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52530.

The product of its digits is 2016, while the sum is 26.

The square root of 13746221 is about 3707.5896482755. The cubic root of 13746221 is about 239.5490432353.

The spelling of 13746221 in words is "thirteen million, seven hundred forty-six thousand, two hundred twenty-one".