31101312222 has 48 divisors (see below), whose sum is σ = 69512640912. Its totient is φ = 10042427520.

The previous prime is 31101312217. The next prime is 31101312223. The reversal of 31101312222 is 22221310113.

31101312222 is a `hidden beast` number, since 31 + 101 + 312 + 222 = 666.

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 = 31101312195 and 31101312204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31101312223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48322 + ... + 254042.

It is an arithmetic number, because the mean of its divisors is an integer number (1448180019).

Almost surely, 2^31101312222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31101312222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34756320456).

31101312222 is an abundant number, since it is smaller than the sum of its proper divisors (38411328690).

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

31101312222 is a wasteful number, since it uses less digits than its factorization.

31101312222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205993 (or 205990 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31101312222 its reverse (22221310113), we get a palindrome (53322622335).

The spelling of 31101312222 in words is "thirty-one billion, one hundred one million, three hundred twelve thousand, two hundred twenty-two".