31222303121 has 4 divisors (see below), whose sum is σ = 31227680052. Its totient is φ = 31216926192.

The previous prime is 31222303117. The next prime is 31222303199. The reversal of 31222303121 is 12130322213.

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 13153566721 + 18068736400 = 114689^2 + 134420^2 .

It is a cyclic number.

It is not a de Polignac number, because 31222303121 - 2² = 31222303117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31222303093 and 31222303102.

It is not an unprimeable number, because it can be changed into a prime (31222303111) 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, 2679746 + ... + 2691371.

It is an arithmetic number, because the mean of its divisors is an integer number (7806920013).

Almost surely, 2^31222303121 is an apocalyptic number.

It is an amenable number.

31222303121 is a deficient number, since it is larger than the sum of its proper divisors (5376931).

31222303121 is an equidigital number, since it uses as much as digits as its factorization.

31222303121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376930.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31222303121 its reverse (12130322213), we get a palindrome (43352625334).

The spelling of 31222303121 in words is "thirty-one billion, two hundred twenty-two million, three hundred three thousand, one hundred twenty-one".