11399739121 has 4 divisors (see below), whose sum is σ = 11401708032. Its totient is φ = 11397770212.

The previous prime is 11399739083. The next prime is 11399739133. The reversal of 11399739121 is 12193799311.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12193799311 = 4079 ⋅2989409.

It is a cyclic number.

It is not a de Polignac number, because 11399739121 - 2²³ = 11391350513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11399734121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 975745 + ... + 987358.

It is an arithmetic number, because the mean of its divisors is an integer number (2850427008).

Almost surely, 2^11399739121 is an apocalyptic number.

It is an amenable number.

11399739121 is a deficient number, since it is larger than the sum of its proper divisors (1968911).

11399739121 is an equidigital number, since it uses as much as digits as its factorization.

11399739121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968910.

The product of its digits is 91854, while the sum is 46.

The spelling of 11399739121 in words is "eleven billion, three hundred ninety-nine million, seven hundred thirty-nine thousand, one hundred twenty-one".