22222121000 has 64 divisors (see below), whose sum is σ = 52514850960. Its totient is φ = 8800800000.

The previous prime is 22222120997. The next prime is 22222121027. The reversal of 22222121000 is 12122222.

It can be written as a sum of positive squares in 8 ways, for example, as 7504063876 + 14718057124 = 86626^2 + 121318^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9011 + ... + 211010.

Almost surely, 2^22222121000 is an apocalyptic number.

22222121000 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 22222121000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26257425480).

22222121000 is an abundant number, since it is smaller than the sum of its proper divisors (30292729960).

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

22222121000 is a wasteful number, since it uses less digits than its factorization.

22222121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220143 (or 220129 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 22222121000 its reverse (12122222), we get a palindrome (22234243222).

The spelling of 22222121000 in words is "twenty-two billion, two hundred twenty-two million, one hundred twenty-one thousand".