31211031122121 has 4 divisors (see below), whose sum is σ = 41614708162832. Its totient is φ = 20807354081412.

The previous prime is 31211031122113. The next prime is 31211031122153. The reversal of 31211031122121 is 12122113011213.

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 not a de Polignac number, because 31211031122121 - 2³ = 31211031122113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31211031162121) 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, 5201838520351 + ... + 5201838520356.

It is an arithmetic number, because the mean of its divisors is an integer number (10403677040708).

Almost surely, 2^{31211031122121} is an apocalyptic number.

It is an amenable number.

31211031122121 is a deficient number, since it is larger than the sum of its proper divisors (10403677040711).

31211031122121 is a wasteful number, since it uses less digits than its factorization.

31211031122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10403677040710.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 31211031122121 its reverse (12122113011213), we get a palindrome (43333144133334).

The spelling of 31211031122121 in words is "thirty-one trillion, two hundred eleven billion, thirty-one million, one hundred twenty-two thousand, one hundred twenty-one".