31222121344 has 32 divisors (see below), whose sum is σ = 62275743000. Its totient is φ = 15592131072.

The previous prime is 31222121339. The next prime is 31222121383. The reversal of 31222121344 is 44312122213.

It is a tau number, because it is divible by the number of its divisors (32).

It is a super-2 number, since 2×31222121344² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 41619 + ... + 253330.

Almost surely, 2^31222121344 is an apocalyptic number.

It is an amenable number.

31222121344 is a deficient number, since it is larger than the sum of its proper divisors (31053621656).

31222121344 is an equidigital number, since it uses as much as digits as its factorization.

31222121344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 295790 (or 295778 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

Adding to 31222121344 its reverse (44312122213), we get a palindrome (75534243557).

The spelling of 31222121344 in words is "thirty-one billion, two hundred twenty-two million, one hundred twenty-one thousand, three hundred forty-four".