1201122100 has 36 divisors (see below), whose sum is σ = 2719763424. Its totient is φ = 459558880.

The previous prime is 1201122089. The next prime is 1201122211. The reversal of 1201122100 is 12211021.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258814 + ... + 263413.

It is an arithmetic number, because the mean of its divisors is an integer number (75548984).

Almost surely, 2^1201122100 is an apocalyptic number.

1201122100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201122100 is an abundant number, since it is smaller than the sum of its proper divisors (1518641324).

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

1201122100 is a wasteful number, since it uses less digits than its factorization.

1201122100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522264 (or 522257 counting only the distinct ones).

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

The square root of 1201122100 is about 34657.2084853930. The cubic root of 1201122100 is about 1062.9896907676.

Adding to 1201122100 its reverse (12211021), we get a palindrome (1213333121).

The spelling of 1201122100 in words is "one billion, two hundred one million, one hundred twenty-two thousand, one hundred".