22222221221000 has 64 divisors (see below), whose sum is σ = 52003323918000. Its totient is φ = 8888319897600.

The previous prime is 22222221220967. The next prime is 22222221221003. The reversal of 22222221221000 is 12212222222.

It can be written as a sum of positive squares in 8 ways, for example, as 1292273315524 + 20929947905476 = 1136782^2 + 4574926^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (22222221221003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15106166 + ... + 16511834.

Almost surely, 2^{22222221221000} is an apocalyptic number.

22222221221000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22222221221000 is an abundant number, since it is smaller than the sum of its proper divisors (29781102697000).

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

22222221221000 is a wasteful number, since it uses less digits than its factorization.

22222221221000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1421499 (or 1421485 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 22222221221000 its reverse (12212222222), we get a palindrome (22234433443222).

The spelling of 22222221221000 in words is "twenty-two trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred twenty-one thousand".