1222101100 has 72 divisors (see below), whose sum is σ = 3063272688. Its totient is φ = 418252800.

The previous prime is 1222101079. The next prime is 1222101137. The reversal of 1222101100 is 11012221.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 13977 + ... + 51376.

It is an arithmetic number, because the mean of its divisors is an integer number (42545454).

Almost surely, 2^1222101100 is an apocalyptic number.

1222101100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1222101100 is an abundant number, since it is smaller than the sum of its proper divisors (1841171588).

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

1222101100 is a wasteful number, since it uses less digits than its factorization.

1222101100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65395 (or 65388 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 1222101100 is about 34958.5626134714. The cubic root of 1222101100 is about 1069.1427903150.

Adding to 1222101100 its reverse (11012221), we get a palindrome (1233113321).

The spelling of 1222101100 in words is "one billion, two hundred twenty-two million, one hundred one thousand, one hundred".