31121142422 has 4 divisors (see below), whose sum is σ = 46681713636. Its totient is φ = 15560571210.

The previous prime is 31121142419. The next prime is 31121142487. The reversal of 31121142422 is 22424112113.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7780285604 + ... + 7780285607.

It is an arithmetic number, because the mean of its divisors is an integer number (11670428409).

Almost surely, 2^31121142422 is an apocalyptic number.

31121142422 is a deficient number, since it is larger than the sum of its proper divisors (15560571214).

31121142422 is a wasteful number, since it uses less digits than its factorization.

31121142422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15560571213.

The product of its digits is 768, while the sum is 23.

Adding to 31121142422 its reverse (22424112113), we get a palindrome (53545254535).

The spelling of 31121142422 in words is "thirty-one billion, one hundred twenty-one million, one hundred forty-two thousand, four hundred twenty-two".