1122220100 has 18 divisors (see below), whose sum is σ = 2435217834. Its totient is φ = 448888000.

The previous prime is 1122220093. The next prime is 1122220139. The reversal of 1122220100 is 10222211.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 378458116 + 743761984 = 19454^2 + 27272^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5611001 + ... + 5611200.

Almost surely, 2^1122220100 is an apocalyptic number.

1122220100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1122220100 is an abundant number, since it is smaller than the sum of its proper divisors (1312997734).

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

1122220100 is a wasteful number, since it uses less digits than its factorization.

1122220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11222215 (or 11222208 counting only the distinct ones).

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

The square root of 1122220100 is about 33499.5537283708. The cubic root of 1122220100 is about 1039.1845493923.

Adding to 1122220100 its reverse (10222211), we get a palindrome (1132442311).

The spelling of 1122220100 in words is "one billion, one hundred twenty-two million, two hundred twenty thousand, one hundred".