13331437121 has 4 divisors (see below), whose sum is σ = 13332980100. Its totient is φ = 13329894144.

The previous prime is 13331437117. The next prime is 13331437139. The reversal of 13331437121 is 12173413331.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12173413331 = 857 ⋅14204683.

It can be written as a sum of positive squares in 2 ways, for example, as 10448928400 + 2882508721 = 102220^2 + 53689^2 .

It is a cyclic number.

It is not a de Polignac number, because 13331437121 - 2² = 13331437117 is a prime.

It is a super-2 number, since 2×13331437121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13331430121) 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, 758456 + ... + 775833.

It is an arithmetic number, because the mean of its divisors is an integer number (3333245025).

Almost surely, 2^13331437121 is an apocalyptic number.

It is an amenable number.

13331437121 is a deficient number, since it is larger than the sum of its proper divisors (1542979).

13331437121 is an equidigital number, since it uses as much as digits as its factorization.

13331437121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542978.

The product of its digits is 4536, while the sum is 29.

The spelling of 13331437121 in words is "thirteen billion, three hundred thirty-one million, four hundred thirty-seven thousand, one hundred twenty-one".