1200101100 has 144 divisors (see below), whose sum is σ = 3802256640. Its totient is φ = 289836800.

The previous prime is 1200101099. The next prime is 1200101131. The reversal of 1200101100 is 11010021.

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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1184194 + ... + 1185206.

It is an arithmetic number, because the mean of its divisors is an integer number (26404560).

Almost surely, 2^1200101100 is an apocalyptic number.

1200101100 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 1200101100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1901128320).

1200101100 is an abundant number, since it is smaller than the sum of its proper divisors (2602155540).

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

1200101100 is a wasteful number, since it uses less digits than its factorization.

1200101100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1400 (or 1393 counting only the distinct ones).

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

The square root of 1200101100 is about 34642.4753734487. The cubic root of 1200101100 is about 1062.6884113394.

Adding to 1200101100 its reverse (11010021), we get a palindrome (1211111121).

The spelling of 1200101100 in words is "one billion, two hundred million, one hundred one thousand, one hundred".