13123908221 has 2 divisors, whose sum is σ = 13123908222. Its totient is φ = 13123908220.

The previous prime is 13123908199. The next prime is 13123908263. The reversal of 13123908221 is 12280932131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11339268196 + 1784640025 = 106486^2 + 42245^2 .

It is a cyclic number.

It is not a de Polignac number, because 13123908221 - 2²² = 13119713917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13123988221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6561954110 + 6561954111.

It is an arithmetic number, because the mean of its divisors is an integer number (6561954111).

Almost surely, 2^13123908221 is an apocalyptic number.

It is an amenable number.

13123908221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13123908221 is an equidigital number, since it uses as much as digits as its factorization.

13123908221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 13123908221 in words is "thirteen billion, one hundred twenty-three million, nine hundred eight thousand, two hundred twenty-one".