222222121020 has 72 divisors (see below), whose sum is σ = 680747820480. Its totient is φ = 58672502400.

The previous prime is 222222121013. The next prime is 222222121021. The reversal of 222222121020 is 20121222222.

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 = 222222120984 and 222222121002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222222121021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6093540 + ... + 6129899.

It is an arithmetic number, because the mean of its divisors is an integer number (9454830840).

Almost surely, 2^222222121020 is an apocalyptic number.

222222121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

222222121020 is an abundant number, since it is smaller than the sum of its proper divisors (458525699460).

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

222222121020 is a wasteful number, since it uses less digits than its factorization.

222222121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12223555 (or 12223550 counting only the distinct ones).

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

Adding to 222222121020 its reverse (20121222222), we get a palindrome (242343343242).

The spelling of 222222121020 in words is "two hundred twenty-two billion, two hundred twenty-two million, one hundred twenty-one thousand, twenty".