31122231012121 has 4 divisors (see below), whose sum is σ = 31443078754612. Its totient is φ = 30801383269632.

The previous prime is 31122231012109. The next prime is 31122231012133. The reversal of 31122231012121 is 12121013222113.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (31122231012109) and next prime (31122231012133).

It can be written as a sum of positive squares in 2 ways, for example, as 17542158448896 + 13580072563225 = 4188336^2 + 3685115^2 .

It is a cyclic number.

It is not a de Polignac number, because 31122231012121 - 2⁹ = 31122231011609 is a prime.

It is a super-2 number, since 2×31122231012121² (a number of 28 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 = 31122231012092 and 31122231012101.

It is not an unprimeable number, because it can be changed into a prime (31122231012161) 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, 160423871100 + ... + 160423871293.

It is an arithmetic number, because the mean of its divisors is an integer number (7860769688653).

Almost surely, 2^{31122231012121} is an apocalyptic number.

It is an amenable number.

31122231012121 is a deficient number, since it is larger than the sum of its proper divisors (320847742491).

31122231012121 is an equidigital number, since it uses as much as digits as its factorization.

31122231012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320847742490.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 31122231012121 its reverse (12121013222113), we get a palindrome (43243244234234).

The spelling of 31122231012121 in words is "thirty-one trillion, one hundred twenty-two billion, two hundred thirty-one million, twelve thousand, one hundred twenty-one".