31230213122 has 4 divisors (see below), whose sum is σ = 46845319686. Its totient is φ = 15615106560.

The previous prime is 31230213121. The next prime is 31230213143. The reversal of 31230213122 is 22131203213.

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., 25248892201 + 5981320921 = 158899^2 + 77339^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31230213094 and 31230213103.

It is not an unprimeable number, because it can be changed into a prime (31230213121) by changing a digit.

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, 7807553279 + ... + 7807553282.

Almost surely, 2^31230213122 is an apocalyptic number.

31230213122 is a deficient number, since it is larger than the sum of its proper divisors (15615106564).

31230213122 is a wasteful number, since it uses less digits than its factorization.

31230213122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15615106563.

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

Adding to 31230213122 its reverse (22131203213), we get a palindrome (53361416335).

Subtracting from 31230213122 its reverse (22131203213), we obtain a palindrome (9099009909).

The spelling of 31230213122 in words is "thirty-one billion, two hundred thirty million, two hundred thirteen thousand, one hundred twenty-two".