13073021 has 4 divisors (see below), whose sum is σ = 14078652. Its totient is φ = 12067392.

The previous prime is 13073009. The next prime is 13073023. The reversal of 13073021 is 12037031.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3024121 + 10048900 = 1739^2 + 3170^2 .

It is a cyclic number.

It is not a de Polignac number, because 13073021 - 2⁶ = 13072957 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 (13073023) 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, 502796 + ... + 502821.

It is an arithmetic number, because the mean of its divisors is an integer number (3519663).

Almost surely, 2^13073021 is an apocalyptic number.

It is an amenable number.

13073021 is a deficient number, since it is larger than the sum of its proper divisors (1005631).

13073021 is a wasteful number, since it uses less digits than its factorization.

13073021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005630.

The product of its (nonzero) digits is 126, while the sum is 17.

The square root of 13073021 is about 3615.6632863141. The cubic root of 13073021 is about 235.5728952747.

The spelling of 13073021 in words is "thirteen million, seventy-three thousand, twenty-one".