13365021 has 4 divisors (see below), whose sum is σ = 17820032. Its totient is φ = 8910012.

The previous prime is 13365007. The next prime is 13365031. The reversal of 13365021 is 12056331.

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.

It is not a de Polignac number, because 13365021 - 2¹⁴ = 13348637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13365031) 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, 2227501 + ... + 2227506.

It is an arithmetic number, because the mean of its divisors is an integer number (4455008).

Almost surely, 2^13365021 is an apocalyptic number.

It is an amenable number.

13365021 is a deficient number, since it is larger than the sum of its proper divisors (4455011).

13365021 is an equidigital number, since it uses as much as digits as its factorization.

13365021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4455010.

The product of its (nonzero) digits is 540, while the sum is 21.

The square root of 13365021 is about 3655.8201542198. The cubic root of 13365021 is about 237.3139210984.

The spelling of 13365021 in words is "thirteen million, three hundred sixty-five thousand, twenty-one".