31100221212 has 48 divisors (see below), whose sum is σ = 77638780800. Its totient is φ = 9660116160.

The previous prime is 31100221181. The next prime is 31100221219. The reversal of 31100221212 is 21212200113.

It is a junction number, because it is equal to n+sod(n) for n = 31100221191 and 31100221200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31100221219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1104162 + ... + 1131977.

It is an arithmetic number, because the mean of its divisors is an integer number (1617474600).

Almost surely, 2^31100221212 is an apocalyptic number.

It is an amenable number.

31100221212 is an abundant number, since it is smaller than the sum of its proper divisors (46538559588).

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

31100221212 is a wasteful number, since it uses less digits than its factorization.

31100221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236226 (or 2236224 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31100221212 its reverse (21212200113), we get a palindrome (52312421325).

The spelling of 31100221212 in words is "thirty-one billion, one hundred million, two hundred twenty-one thousand, two hundred twelve".