13109021 has 2 divisors, whose sum is σ = 13109022. Its totient is φ = 13109020.

The previous prime is 13109009. The next prime is 13109051. The reversal of 13109021 is 12090131.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11868025 + 1240996 = 3445^2 + 1114^2 .

It is an emirp because it is prime and its reverse (12090131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13109021 - 2¹⁴ = 13092637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13109051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6554510 + 6554511.

It is an arithmetic number, because the mean of its divisors is an integer number (6554511).

Almost surely, 2^13109021 is an apocalyptic number.

It is an amenable number.

13109021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13109021 is an equidigital number, since it uses as much as digits as its factorization.

13109021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 13109021 is about 3620.6382034111. The cubic root of 13109021 is about 235.7889343874.

Adding to 13109021 its reverse (12090131), we get a palindrome (25199152).

The spelling of 13109021 in words is "thirteen million, one hundred nine thousand, twenty-one".