31122131220122 has 4 divisors (see below), whose sum is σ = 46683196830186. Its totient is φ = 15561065610060.

The previous prime is 31122131220109. The next prime is 31122131220157. The reversal of 31122131220122 is 22102213122113.

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

It can be written as a sum of positive squares in only one way, i.e., 29170379723521 + 1951751496601 = 5400961^2 + 1397051^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780532805029 + ... + 7780532805032.

Almost surely, 2^{31122131220122} is an apocalyptic number.

31122131220122 is a deficient number, since it is larger than the sum of its proper divisors (15561065610064).

31122131220122 is a wasteful number, since it uses less digits than its factorization.

31122131220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15561065610063.

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

Adding to 31122131220122 its reverse (22102213122113), we get a palindrome (53224344342235).

The spelling of 31122131220122 in words is "thirty-one trillion, one hundred twenty-two billion, one hundred thirty-one million, two hundred twenty thousand, one hundred twenty-two".