1101200121 has 24 divisors (see below), whose sum is σ = 1847661504. Its totient is φ = 618939360.

The previous prime is 1101200101. The next prime is 1101200123. The reversal of 1101200121 is 1210021011.

It is a happy number.

It is not a de Polignac number, because 1101200121 - 2⁷ = 1101199993 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1101200123) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 139431 + ... + 147116.

It is an arithmetic number, because the mean of its divisors is an integer number (76985896).

Almost surely, 2^1101200121 is an apocalyptic number.

It is an amenable number.

1101200121 is a deficient number, since it is larger than the sum of its proper divisors (746461383).

1101200121 is a wasteful number, since it uses less digits than its factorization.

1101200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286621 (or 286618 counting only the distinct ones).

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

The square root of 1101200121 is about 33184.3354762454. The cubic root of 1101200121 is about 1032.6553914494.

Adding to 1101200121 its reverse (1210021011), we get a palindrome (2311221132).

The spelling of 1101200121 in words is "one billion, one hundred one million, two hundred thousand, one hundred twenty-one".