31223143120422 has 128 divisors (see below), whose sum is σ = 69301504419840. Its totient is φ = 9299200055040.

The previous prime is 31223143120399. The next prime is 31223143120439. The reversal of 31223143120422 is 22402134132213.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 31223143120422.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 959603338 + ... + 959635874.

It is an arithmetic number, because the mean of its divisors is an integer number (541418003280).

Almost surely, 2^{31223143120422} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31223143120422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34650752209920).

31223143120422 is an abundant number, since it is smaller than the sum of its proper divisors (38078361299418).

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

31223143120422 is a wasteful number, since it uses less digits than its factorization.

31223143120422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33538.

The product of its (nonzero) digits is 13824, while the sum is 30.

Adding to 31223143120422 its reverse (22402134132213), we get a palindrome (53625277252635).

The spelling of 31223143120422 in words is "thirty-one trillion, two hundred twenty-three billion, one hundred forty-three million, one hundred twenty thousand, four hundred twenty-two".