1115221700 has 72 divisors (see below), whose sum is σ = 2563294272. Its totient is φ = 420266880.

The previous prime is 1115221693. The next prime is 1115221741. The reversal of 1115221700 is 71225111.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 150482 + ... + 157718.

Almost surely, 2^1115221700 is an apocalyptic number.

1115221700 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 1115221700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1281647136).

1115221700 is an abundant number, since it is smaller than the sum of its proper divisors (1448072572).

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

1115221700 is a wasteful number, since it uses less digits than its factorization.

1115221700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7341 (or 7334 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 1115221700 is about 33394.9352447343. The cubic root of 1115221700 is about 1037.0198523403.

Adding to 1115221700 its reverse (71225111), we get a palindrome (1186446811).

The spelling of 1115221700 in words is "one billion, one hundred fifteen million, two hundred twenty-one thousand, seven hundred".