1200001121 has 16 divisors (see below), whose sum is σ = 1356307200. Its totient is φ = 1051680000.

The previous prime is 1200001097. The next prime is 1200001123. The reversal of 1200001121 is 1211000021.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200001121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1200001099 and 1200001108.

It is not an unprimeable number, because it can be changed into a prime (1200001123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237065 + ... + 242073.

It is an arithmetic number, because the mean of its divisors is an integer number (84769200).

Almost surely, 2^1200001121 is an apocalyptic number.

1200001121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1200001121 is a deficient number, since it is larger than the sum of its proper divisors (156306079).

1200001121 is a wasteful number, since it uses less digits than its factorization.

1200001121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5800.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1200001121 is about 34641.0323316151. The cubic root of 1200001121 is about 1062.6589000826.

Adding to 1200001121 its reverse (1211000021), we get a palindrome (2411001142).

It can be divided in two parts, 120000 and 1121, that added together give a palindrome (121121).

The spelling of 1200001121 in words is "one billion, two hundred million, one thousand, one hundred twenty-one".