13923301921 has 2 divisors, whose sum is σ = 13923301922. Its totient is φ = 13923301920.

The previous prime is 13923301907. The next prime is 13923301939. The reversal of 13923301921 is 12910332931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13415430625 + 507871296 = 115825^2 + 22536^2 .

It is an emirp because it is prime and its reverse (12910332931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13923301921 - 2¹³ = 13923293729 is a prime.

It is not a weakly prime, because it can be changed into another prime (13923301981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6961650960 + 6961650961.

It is an arithmetic number, because the mean of its divisors is an integer number (6961650961).

Almost surely, 2^13923301921 is an apocalyptic number.

It is an amenable number.

13923301921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13923301921 is an equidigital number, since it uses as much as digits as its factorization.

13923301921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 34.

It can be divided in two parts, 13923 and 301921, that added together give a square (315844 = 562²).

The spelling of 13923301921 in words is "thirteen billion, nine hundred twenty-three million, three hundred one thousand, nine hundred twenty-one".