1121201100 has 54 divisors (see below), whose sum is σ = 3514345380. Its totient is φ = 298986720.

The previous prime is 1121201099. The next prime is 1121201143. The reversal of 1121201100 is 11021211.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 621990 + ... + 623789.

It is an arithmetic number, because the mean of its divisors is an integer number (65080470).

Almost surely, 2^1121201100 is an apocalyptic number.

1121201100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121201100 is an abundant number, since it is smaller than the sum of its proper divisors (2393144280).

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

1121201100 is a wasteful number, since it uses less digits than its factorization.

1121201100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1245799 (or 1245789 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 1121201100 is about 33484.3411164084. The cubic root of 1121201100 is about 1038.8699201653.

Adding to 1121201100 its reverse (11021211), we get a palindrome (1132222311).

The spelling of 1121201100 in words is "one billion, one hundred twenty-one million, two hundred one thousand, one hundred".