31212304133 has 4 divisors (see below), whose sum is σ = 31237660608. Its totient is φ = 31186947660.

The previous prime is 31212304117. The next prime is 31212304157. The reversal of 31212304133 is 33140321213.

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.

It is a cyclic number.

It is not a de Polignac number, because 31212304133 - 2⁴ = 31212304117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212304099 and 31212304108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212304163) 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, 12676391 + ... + 12678852.

It is an arithmetic number, because the mean of its divisors is an integer number (7809415152).

Almost surely, 2^31212304133 is an apocalyptic number.

It is an amenable number.

31212304133 is a deficient number, since it is larger than the sum of its proper divisors (25356475).

31212304133 is a wasteful number, since it uses less digits than its factorization.

31212304133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25356474.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31212304133 its reverse (33140321213), we get a palindrome (64352625346).

The spelling of 31212304133 in words is "thirty-one billion, two hundred twelve million, three hundred four thousand, one hundred thirty-three".