1111221100 has 36 divisors (see below), whose sum is σ = 2630566008. Its totient is φ = 404080000.

The previous prime is 1111221091. The next prime is 1111221107. The reversal of 1111221100 is 11221111.

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

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (1111221107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 504001 + ... + 506200.

It is an arithmetic number, because the mean of its divisors is an integer number (73071278).

Almost surely, 2^1111221100 is an apocalyptic number.

1111221100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1111221100 is an abundant number, since it is smaller than the sum of its proper divisors (1519344908).

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

1111221100 is a wasteful number, since it uses less digits than its factorization.

1111221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010226 (or 1010219 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 1111221100 is about 33334.9831258394. The cubic root of 1111221100 is about 1035.7783436287.

Adding to 1111221100 its reverse (11221111), we get a palindrome (1122442211).

It can be divided in two parts, 11 and 11221100, that multiplied together give a square (123432100 = 11110²).

The spelling of 1111221100 in words is "one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred".