13124021 has 2 divisors, whose sum is σ = 13124022. Its totient is φ = 13124020.

The previous prime is 13123997. The next prime is 13124047. The reversal of 13124021 is 12042131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12780625 + 343396 = 3575^2 + 586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13124021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13123987 and 13124005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13124071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6562010 + 6562011.

It is an arithmetic number, because the mean of its divisors is an integer number (6562011).

Almost surely, 2^13124021 is an apocalyptic number.

It is an amenable number.

13124021 is a deficient number, since it is larger than the sum of its proper divisors (1).

13124021 is an equidigital number, since it uses as much as digits as its factorization.

13124021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 13124021 is about 3622.7090691912. The cubic root of 13124021 is about 235.8788339527.

Adding to 13124021 its reverse (12042131), we get a palindrome (25166152).

The spelling of 13124021 in words is "thirteen million, one hundred twenty-four thousand, twenty-one".