1222201100 has 72 divisors (see below), whose sum is σ = 2724825600. Its totient is φ = 475675200.

The previous prime is 1222201093. The next prime is 1222201157. The reversal of 1222201100 is 11022221.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 559811 + ... + 561989.

It is an arithmetic number, because the mean of its divisors is an integer number (37844800).

Almost surely, 2^1222201100 is an apocalyptic number.

1222201100 is a gapful number since it is divisible by the number (10) 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 1222201100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1362412800).

1222201100 is an abundant number, since it is smaller than the sum of its proper divisors (1502624500).

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

1222201100 is a wasteful number, since it uses less digits than its factorization.

1222201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343 (or 2336 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1222201100 is about 34959.9928489695. The cubic root of 1222201100 is about 1069.1719508492.

Adding to 1222201100 its reverse (11022221), we get a palindrome (1233223321).

The spelling of 1222201100 in words is "one billion, two hundred twenty-two million, two hundred one thousand, one hundred".