21220320222 has 80 divisors (see below), whose sum is σ = 48652210464. Its totient is φ = 6910920000.

The previous prime is 21220320211. The next prime is 21220320241. The reversal of 21220320222 is 22202302212.

21220320222 is a `hidden beast` number, since 2 + 122 + 0 + 320 + 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 = 21220320195 and 21220320204.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1485072 + ... + 1499292.

Almost surely, 2^21220320222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21220320222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24326105232).

21220320222 is an abundant number, since it is smaller than the sum of its proper divisors (27431890242).

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

21220320222 is a wasteful number, since it uses less digits than its factorization.

21220320222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14447 (or 14438 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21220320222 its reverse (22202302212), we get a palindrome (43422622434).

The spelling of 21220320222 in words is "twenty-one billion, two hundred twenty million, three hundred twenty thousand, two hundred twenty-two".