13012921 has 2 divisors, whose sum is σ = 13012922. Its totient is φ = 13012920.

The previous prime is 13012913. The next prime is 13012927. The reversal of 13012921 is 12921031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12390400 + 622521 = 3520^2 + 789^2 .

It is a cyclic number.

It is not a de Polignac number, because 13012921 - 2³ = 13012913 is a prime.

It is a super-2 number, since 2×13012921² = 338672225904482, which contains 22 as substring.

It is equal to p₈₅₀₀₄₂ and since 13012921 and 850042 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (13012927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6506460 + 6506461.

It is an arithmetic number, because the mean of its divisors is an integer number (6506461).

Almost surely, 2^13012921 is an apocalyptic number.

It is an amenable number.

13012921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13012921 is an equidigital number, since it uses as much as digits as its factorization.

13012921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 13012921 is about 3607.3426507611. The cubic root of 13012921 is about 235.2113445039.

Adding to 13012921 its reverse (12921031), we get a palindrome (25933952).

The spelling of 13012921 in words is "thirteen million, twelve thousand, nine hundred twenty-one".