31133130121 has 4 divisors (see below), whose sum is σ = 31133646544. Its totient is φ = 31132613700.

The previous prime is 31133130109. The next prime is 31133130157. The reversal of 31133130121 is 12103133113.

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: 12103133113 = 25793 ⋅469241.

It is a cyclic number.

It is not a de Polignac number, because 31133130121 - 2⁹ = 31133129609 is a prime.

It is a super-2 number, since 2×31133130121² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31133131121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153675 + ... + 293056.

It is an arithmetic number, because the mean of its divisors is an integer number (7783411636).

Almost surely, 2^31133130121 is an apocalyptic number.

It is an amenable number.

31133130121 is a deficient number, since it is larger than the sum of its proper divisors (516423).

31133130121 is an equidigital number, since it uses as much as digits as its factorization.

31133130121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516422.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31133130121 its reverse (12103133113), we get a palindrome (43236263234).

The spelling of 31133130121 in words is "thirty-one billion, one hundred thirty-three million, one hundred thirty thousand, one hundred twenty-one".