22221121000 has 64 divisors (see below), whose sum is σ = 55997257680. Its totient is φ = 8204716800.

The previous prime is 22221120983. The next prime is 22221121033. The reversal of 22221121000 is 12112222.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 2789318596 + 19431802404 = 52814^2 + 139398^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841659 + ... + 867658.

Almost surely, 2^22221121000 is an apocalyptic number.

22221121000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22221121000 is an abundant number, since it is smaller than the sum of its proper divisors (33776136680).

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

22221121000 is a wasteful number, since it uses less digits than its factorization.

22221121000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709351 (or 1709337 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22221121000 its reverse (12112222), we get a palindrome (22233233222).

The spelling of 22221121000 in words is "twenty-two billion, two hundred twenty-one million, one hundred twenty-one thousand".