222021021220 has 24 divisors (see below), whose sum is σ = 468610874424. Its totient is φ = 88357602816.

The previous prime is 222021021199. The next prime is 222021021259. The reversal of 222021021220 is 22120120222.

It can be written as a sum of positive squares in 4 ways, for example, as 15192534564 + 206828486656 = 123258^2 + 454784^2 .

It is a junction number, because it is equal to n+sod(n) for n = 222021021194 and 222021021203.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28171317 + ... + 28179196.

It is an arithmetic number, because the mean of its divisors is an integer number (19525453101).

Almost surely, 2^222021021220 is an apocalyptic number.

222021021220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222021021220 is an abundant number, since it is smaller than the sum of its proper divisors (246589853204).

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

222021021220 is a wasteful number, since it uses less digits than its factorization.

222021021220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56350719 (or 56350717 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 222021021220 its reverse (22120120222), we get a palindrome (244141141442).

The spelling of 222021021220 in words is "two hundred twenty-two billion, twenty-one million, twenty-one thousand, two hundred twenty".