13899192121 has 2 divisors, whose sum is σ = 13899192122. Its totient is φ = 13899192120.

The previous prime is 13899192103. The next prime is 13899192187. The reversal of 13899192121 is 12129199831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13628227600 + 270964521 = 116740^2 + 16461^2 .

It is a cyclic number.

It is not a de Polignac number, because 13899192121 - 2⁵ = 13899192089 is a prime.

It is not a weakly prime, because it can be changed into another prime (13899192221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6949596060 + 6949596061.

It is an arithmetic number, because the mean of its divisors is an integer number (6949596061).

Almost surely, 2^13899192121 is an apocalyptic number.

It is an amenable number.

13899192121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13899192121 is an equidigital number, since it uses as much as digits as its factorization.

13899192121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 46.

The spelling of 13899192121 in words is "thirteen billion, eight hundred ninety-nine million, one hundred ninety-two thousand, one hundred twenty-one".