31122002220 has 96 divisors (see below), whose sum is σ = 89463177216. Its totient is φ = 8079955200.

The previous prime is 31122002089. The next prime is 31122002231. The reversal of 31122002220 is 2220022113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31122002220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 509730 + ... + 567510.

It is an arithmetic number, because the mean of its divisors is an integer number (931908096).

Almost surely, 2^31122002220 is an apocalyptic number.

31122002220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31122002220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44731588608).

31122002220 is an abundant number, since it is smaller than the sum of its proper divisors (58341174996).

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

31122002220 is a wasteful number, since it uses less digits than its factorization.

31122002220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58031 (or 58029 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 31122002220 its reverse (2220022113), we get a palindrome (33342024333).

The spelling of 31122002220 in words is "thirty-one billion, one hundred twenty-two million, two thousand, two hundred twenty".