13157021 has 2 divisors, whose sum is σ = 13157022. Its totient is φ = 13157020.

The previous prime is 13157017. The next prime is 13157033. The reversal of 13157021 is 12075131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7344100 + 5812921 = 2710^2 + 2411^2 .

It is a cyclic number.

It is not a de Polignac number, because 13157021 - 2² = 13157017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13156984 and 13157002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13157821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6578510 + 6578511.

It is an arithmetic number, because the mean of its divisors is an integer number (6578511).

Almost surely, 2^13157021 is an apocalyptic number.

It is an amenable number.

13157021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13157021 is an equidigital number, since it uses as much as digits as its factorization.

13157021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 210, while the sum is 20.

The square root of 13157021 is about 3627.2608122383. The cubic root of 13157021 is about 236.0763721512.

The spelling of 13157021 in words is "thirteen million, one hundred fifty-seven thousand, twenty-one".