222221021220 has 144 divisors (see below), whose sum is σ = 746325373248. Its totient is φ = 53067674880.

The previous prime is 222221021219. The next prime is 222221021227. The reversal of 222221021220 is 22120122222.

222221021220 is a `hidden beast` number, since 2 + 222 + 210 + 212 + 20 = 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 = 222221021193 and 222221021202.

It is not an unprimeable number, because it can be changed into a prime (222221021227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 704899 + ... + 970218.

It is an arithmetic number, because the mean of its divisors is an integer number (5182815092).

Almost surely, 2^222221021220 is an apocalyptic number.

222221021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222221021220 is an abundant number, since it is smaller than the sum of its proper divisors (524104352028).

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

222221021220 is a wasteful number, since it uses less digits than its factorization.

222221021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675210 (or 1675205 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 222221021220 its reverse (22120122222), we get a palindrome (244341143442).

The spelling of 222221021220 in words is "two hundred twenty-two billion, two hundred twenty-one million, twenty-one thousand, two hundred twenty".