31320100222220 has 24 divisors (see below), whose sum is σ = 67893894676608. Its totient is φ = 12123909763200.

The previous prime is 31320100222219. The next prime is 31320100222223. The reversal of 31320100222220 is 2222200102313.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31320100222192 and 31320100222201.

It is not an unprimeable number, because it can be changed into a prime (31320100222223) 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 7 ways as a sum of consecutive naturals, for example, 25258144721 + ... + 25258145960.

It is an arithmetic number, because the mean of its divisors is an integer number (2828912278192).

Almost surely, 2^{31320100222220} is an apocalyptic number.

It is an amenable number.

31320100222220 is an abundant number, since it is smaller than the sum of its proper divisors (36573794454388).

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

31320100222220 is a wasteful number, since it uses less digits than its factorization.

31320100222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50516290721 (or 50516290719 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31320100222220 its reverse (2222200102313), we get a palindrome (33542300324533).

The spelling of 31320100222220 in words is "thirty-one trillion, three hundred twenty billion, one hundred million, two hundred twenty-two thousand, two hundred twenty".