222120001000 has 128 divisors (see below), whose sum is σ = 534429342720. Its totient is φ = 86356800000.

The previous prime is 222120000943. The next prime is 222120001003. The reversal of 222120001000 is 100021222.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (222120001003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11101005 + ... + 11120995.

It is an arithmetic number, because the mean of its divisors is an integer number (4175229240).

Almost surely, 2^222120001000 is an apocalyptic number.

222120001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222120001000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267214671360).

222120001000 is an abundant number, since it is smaller than the sum of its proper divisors (312309341720).

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

222120001000 is a wasteful number, since it uses less digits than its factorization.

222120001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20324 (or 20310 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 222120001000 its reverse (100021222), we get a palindrome (222220022222).

The spelling of 222120001000 in words is "two hundred twenty-two billion, one hundred twenty million, one thousand".