31222041220 has 96 divisors (see below), whose sum is σ = 71903462400. Its totient is φ = 11336785920.

The previous prime is 31222041211. The next prime is 31222041229. The reversal of 31222041220 is 2214022213.

It is an interprime number because it is at equal distance from previous prime (31222041211) and next prime (31222041229).

It is not an unprimeable number, because it can be changed into a prime (31222041229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3230956 + ... + 3240604.

It is an arithmetic number, because the mean of its divisors is an integer number (748994400).

Almost surely, 2^31222041220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31222041220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35951731200).

31222041220 is an abundant number, since it is smaller than the sum of its proper divisors (40681421180).

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

31222041220 is a wasteful number, since it uses less digits than its factorization.

31222041220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10013 (or 10011 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 31222041220 its reverse (2214022213), we get a palindrome (33436063433).

The spelling of 31222041220 in words is "thirty-one billion, two hundred twenty-two million, forty-one thousand, two hundred twenty".