222121220000 has 120 divisors (see below), whose sum is σ = 551866949172. Its totient is φ = 87968000000.

The previous prime is 222121219967. The next prime is 222121220003. The reversal of 222121220000 is 22121222.

It can be written as a sum of positive squares in 10 ways, for example, as 24924831376 + 197196388624 = 157876^2 + 444068^2 .

It is not an unprimeable number, because it can be changed into a prime (222121220003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1965020 + ... + 2074980.

Almost surely, 2^222121220000 is an apocalyptic number.

222121220000 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 222121220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275933474586).

222121220000 is an abundant number, since it is smaller than the sum of its proper divisors (329745729172).

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

222121220000 is a wasteful number, since it uses less digits than its factorization.

222121220000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110092 (or 110069 counting only the distinct ones).

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

Adding to 222121220000 its reverse (22121222), we get a palindrome (222143341222).

The spelling of 222121220000 in words is "two hundred twenty-two billion, one hundred twenty-one million, two hundred twenty thousand".