31222022220 has 72 divisors (see below), whose sum is σ = 96909308496. Its totient is φ = 8132245632.

The previous prime is 31222022219. The next prime is 31222022257. The reversal of 31222022220 is 2222022213.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31222022193 and 31222022202.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2009187 + ... + 2024666.

It is an arithmetic number, because the mean of its divisors is an integer number (1345962618).

Almost surely, 2^31222022220 is an apocalyptic number.

31222022220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31222022220 is an abundant number, since it is smaller than the sum of its proper divisors (65687286276).

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

31222022220 is a wasteful number, since it uses less digits than its factorization.

31222022220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4033911 (or 4033906 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 31222022220 its reverse (2222022213), we get a palindrome (33444044433).

The spelling of 31222022220 in words is "thirty-one billion, two hundred twenty-two million, twenty-two thousand, two hundred twenty".