33131212131 has 4 divisors (see below), whose sum is σ = 44174949512. Its totient is φ = 22087474752.

The previous prime is 33131212117. The next prime is 33131212157. The reversal of 33131212131 is 13121213133.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 33131212131 - 2⁶ = 33131212067 is a prime.

It is a super-2 number, since 2×33131212131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33131212098 and 33131212107.

It is not an unprimeable number, because it can be changed into a prime (33131212531) 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, 5521868686 + ... + 5521868691.

It is an arithmetic number, because the mean of its divisors is an integer number (11043737378).

Almost surely, 2^33131212131 is an apocalyptic number.

33131212131 is a deficient number, since it is larger than the sum of its proper divisors (11043737381).

33131212131 is a wasteful number, since it uses less digits than its factorization.

33131212131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11043737380.

The product of its digits is 324, while the sum is 21.

Adding to 33131212131 its reverse (13121213133), we get a palindrome (46252425264).

The spelling of 33131212131 in words is "thirty-three billion, one hundred thirty-one million, two hundred twelve thousand, one hundred thirty-one".