1222100000 has 216 divisors, whose sum is σ = 3338294148. Its totient is φ = 440000000.

The previous prime is 1222099999. The next prime is 1222100017. The reversal of 1222100000 is 12221.

It can be written as a sum of positive squares in 6 ways, for example, as 4648336 + 1217451664 = 2156^2 + 34892^2 .

It is a Harshad number since it is a multiple of its sum of digits (8).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 12099950 + ... + 12100050.

Almost surely, 2^1222100000 is an apocalyptic number.

1222100000 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 1222100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1669147074).

1222100000 is an abundant number, since it is smaller than the sum of its proper divisors (2116194148).

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

1222100000 is an equidigital number, since it uses as much as digits as its factorization.

1222100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 1222100000 is about 34958.5468805555. The cubic root of 1222100000 is about 1069.1424695402.

Adding to 1222100000 its reverse (12221), we get a palindrome (1222112221).

1222100000 divided by its reverse (12221) gives a 5-th power (100000 = 10⁵).

The spelling of 1222100000 in words is "one billion, two hundred twenty-two million, one hundred thousand".