31221403422 has 96 divisors (see below), whose sum is σ = 70796329344. Its totient is φ = 9102844800.

The previous prime is 31221403391. The next prime is 31221403427. The reversal of 31221403422 is 22430412213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31221403392 and 31221403401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221403427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19259772 + ... + 19261392.

It is an arithmetic number, because the mean of its divisors is an integer number (737461764).

Almost surely, 2^31221403422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31221403422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35398164672).

31221403422 is an abundant number, since it is smaller than the sum of its proper divisors (39574925922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221403422 is a wasteful number, since it uses less digits than its factorization.

31221403422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042 (or 2013 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 31221403422 its reverse (22430412213), we get a palindrome (53651815635).

The spelling of 31221403422 in words is "thirty-one billion, two hundred twenty-one million, four hundred three thousand, four hundred twenty-two".