13400012921 has 2 divisors, whose sum is σ = 13400012922. Its totient is φ = 13400012920.

The previous prime is 13400012909. The next prime is 13400012929. The reversal of 13400012921 is 12921000431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7605758521 + 5794254400 = 87211^2 + 76120^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13400012921 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13400012929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6700006460 + 6700006461.

It is an arithmetic number, because the mean of its divisors is an integer number (6700006461).

Almost surely, 2^13400012921 is an apocalyptic number.

It is an amenable number.

13400012921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13400012921 is an equidigital number, since it uses as much as digits as its factorization.

13400012921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 13400012921 in words is "thirteen billion, four hundred million, twelve thousand, nine hundred twenty-one".