1201100100 has 36 divisors (see below), whose sum is σ = 3475183824. Its totient is φ = 320293280.

The previous prime is 1201100081. The next prime is 1201100101. The reversal of 1201100100 is 10011021.

It is a Harshad number since it is a multiple of its sum of digits (6).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is not an unprimeable number, because it can be changed into a prime (1201100101) 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, 2001534 + ... + 2002133.

It is an arithmetic number, because the mean of its divisors is an integer number (96532884).

Almost surely, 2^1201100100 is an apocalyptic number.

1201100100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1201100100 is an abundant number, since it is smaller than the sum of its proper divisors (2274083724).

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

1201100100 is a wasteful number, since it uses less digits than its factorization.

1201100100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4003684 (or 4003677 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 6.

The square root of 1201100100 is about 34656.8910896520. The cubic root of 1201100100 is about 1062.9832007486.

Adding to 1201100100 its reverse (10011021), we get a palindrome (1211111121).

The spelling of 1201100100 in words is "one billion, two hundred one million, one hundred thousand, one hundred".