1131021100 has 36 divisors (see below), whose sum is σ = 2677438008. Its totient is φ = 411280000.

The previous prime is 1131021097. The next prime is 1131021139. The reversal of 1131021100 is 11201311.

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 11 ways as a sum of consecutive naturals, for example, 513001 + ... + 515200.

It is an arithmetic number, because the mean of its divisors is an integer number (74373278).

Almost surely, 2^1131021100 is an apocalyptic number.

1131021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131021100 is an abundant number, since it is smaller than the sum of its proper divisors (1546416908).

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

1131021100 is a wasteful number, since it uses less digits than its factorization.

1131021100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028226 (or 1028219 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1131021100 is about 33630.6571449325. The cubic root of 1131021100 is about 1041.8940767141.

Adding to 1131021100 its reverse (11201311), we get a palindrome (1142222411).

The spelling of 1131021100 in words is "one billion, one hundred thirty-one million, twenty-one thousand, one hundred".