31212032122121 has 4 divisors (see below), whose sum is σ = 32055600557892. Its totient is φ = 30368463686352.

The previous prime is 31212032122099. The next prime is 31212032122157. The reversal of 31212032122121 is 12122123021213.

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 28514948523721 + 2697083598400 = 5339939^2 + 1642280^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212032122121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31212032124121) 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, 421784217830 + ... + 421784217903.

It is an arithmetic number, because the mean of its divisors is an integer number (8013900139473).

Almost surely, 2^{31212032122121} is an apocalyptic number.

It is an amenable number.

31212032122121 is a deficient number, since it is larger than the sum of its proper divisors (843568435771).

31212032122121 is an equidigital number, since it uses as much as digits as its factorization.

31212032122121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843568435770.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 31212032122121 its reverse (12122123021213), we get a palindrome (43334155143334).

The spelling of 31212032122121 in words is "thirty-one trillion, two hundred twelve billion, thirty-two million, one hundred twenty-two thousand, one hundred twenty-one".