13221923381 has 2 divisors, whose sum is σ = 13221923382. Its totient is φ = 13221923380.

The previous prime is 13221923371. The next prime is 13221923411. The reversal of 13221923381 is 18332912231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12010187281 + 1211736100 = 109591^2 + 34810^2 .

It is an emirp because it is prime and its reverse (18332912231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13221923381 - 2⁶ = 13221923317 is a prime.

It is a super-2 number, since 2×13221923381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13221923371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6610961690 + 6610961691.

It is an arithmetic number, because the mean of its divisors is an integer number (6610961691).

Almost surely, 2^13221923381 is an apocalyptic number.

It is an amenable number.

13221923381 is a deficient number, since it is larger than the sum of its proper divisors (1).

13221923381 is an equidigital number, since it uses as much as digits as its factorization.

13221923381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 35.

The spelling of 13221923381 in words is "thirteen billion, two hundred twenty-one million, nine hundred twenty-three thousand, three hundred eighty-one".