13126021 has 2 divisors, whose sum is σ = 13126022. Its totient is φ = 13126020.

The previous prime is 13126007. The next prime is 13126039. The reversal of 13126021 is 12062131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13060996 + 65025 = 3614^2 + 255^2 .

It is a cyclic number.

It is not a de Polignac number, because 13126021 - 2⁹ = 13125509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13125986 and 13126004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13126121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6563010 + 6563011.

It is an arithmetic number, because the mean of its divisors is an integer number (6563011).

Almost surely, 2^13126021 is an apocalyptic number.

It is an amenable number.

13126021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13126021 is an equidigital number, since it uses as much as digits as its factorization.

13126021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 13126021 is about 3622.9850951943. The cubic root of 13126021 is about 235.8908153849.

Adding to 13126021 its reverse (12062131), we get a palindrome (25188152).

The spelling of 13126021 in words is "thirteen million, one hundred twenty-six thousand, twenty-one".