311210220122 has 4 divisors (see below), whose sum is σ = 466815330186. Its totient is φ = 155605110060.

The previous prime is 311210220109. The next prime is 311210220131. The reversal of 311210220122 is 221022012113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221022012113 = 7 ⋅31574573159.

It can be written as a sum of positive squares in only one way, i.e., 311208895321 + 1324801 = 557861^2 + 1151^2 .

It is a super-2 number, since 2×311210220122² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 311210220122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77802555029 + ... + 77802555032.

Almost surely, 2^311210220122 is an apocalyptic number.

311210220122 is a deficient number, since it is larger than the sum of its proper divisors (155605110064).

311210220122 is a wasteful number, since it uses less digits than its factorization.

311210220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155605110063.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 311210220122 its reverse (221022012113), we get a palindrome (532232232235).

The spelling of 311210220122 in words is "three hundred eleven billion, two hundred ten million, two hundred twenty thousand, one hundred twenty-two".