31001220122 has 4 divisors (see below), whose sum is σ = 46501830186. Its totient is φ = 15500610060.

The previous prime is 31001220109. The next prime is 31001220137. The reversal of 31001220122 is 22102210013.

It is a happy number.

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., 30674369881 + 326850241 = 175141^2 + 18079^2 .

It is a super-2 number, since 2×31001220122² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31001220097 and 31001220106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7750305029 + ... + 7750305032.

Almost surely, 2^31001220122 is an apocalyptic number.

31001220122 is a deficient number, since it is larger than the sum of its proper divisors (15500610064).

31001220122 is a wasteful number, since it uses less digits than its factorization.

31001220122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15500610063.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31001220122 its reverse (22102210013), we get a palindrome (53103430135).

The spelling of 31001220122 in words is "thirty-one billion, one million, two hundred twenty thousand, one hundred twenty-two".