31212142133 has 4 divisors (see below), whose sum is σ = 32055713580. Its totient is φ = 30368570688.

The previous prime is 31212142109. The next prime is 31212142151. The reversal of 31212142133 is 33124121213.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27166291684 + 4045850449 = 164822^2 + 63607^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212142133 - 2¹⁸ = 31211879989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212142099 and 31212142108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212142733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 421785668 + ... + 421785741.

It is an arithmetic number, because the mean of its divisors is an integer number (8013928395).

Almost surely, 2^31212142133 is an apocalyptic number.

It is an amenable number.

31212142133 is a deficient number, since it is larger than the sum of its proper divisors (843571447).

31212142133 is an equidigital number, since it uses as much as digits as its factorization.

31212142133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843571446.

The product of its digits is 864, while the sum is 23.

Adding to 31212142133 its reverse (33124121213), we get a palindrome (64336263346).

The spelling of 31212142133 in words is "thirty-one billion, two hundred twelve million, one hundred forty-two thousand, one hundred thirty-three".