31221132222 has 32 divisors (see below), whose sum is σ = 71372259072. Its totient is φ = 8919114624.

The previous prime is 31221132211. The next prime is 31221132227. The reversal of 31221132222 is 22223112213.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221132227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 290353 + ... + 383075.

It is an arithmetic number, because the mean of its divisors is an integer number (2230383096).

Almost surely, 2^31221132222 is an apocalyptic number.

31221132222 is an abundant number, since it is smaller than the sum of its proper divisors (40151126850).

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

31221132222 is a wasteful number, since it uses less digits than its factorization.

31221132222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100752.

The product of its digits is 576, while the sum is 21.

Adding to 31221132222 its reverse (22223112213), we get a palindrome (53444244435).

The spelling of 31221132222 in words is "thirty-one billion, two hundred twenty-one million, one hundred thirty-two thousand, two hundred twenty-two".