1121204405 has 4 divisors (see below), whose sum is σ = 1345445292. Its totient is φ = 896963520.

The previous prime is 1121204393. The next prime is 1121204443. The reversal of 1121204405 is 5044021211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 184905604 + 936298801 = 13598^2 + 30599^2 .

It is not a de Polignac number, because 1121204405 - 2⁴ = 1121204389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112120436 + ... + 112120445.

It is an arithmetic number, because the mean of its divisors is an integer number (336361323).

Almost surely, 2^1121204405 is an apocalyptic number.

It is an amenable number.

1121204405 is a deficient number, since it is larger than the sum of its proper divisors (224240887).

1121204405 is an equidigital number, since it uses as much as digits as its factorization.

1121204405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224240886.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 1121204405 is about 33484.3904677986. The cubic root of 1121204405 is about 1038.8709409342.

Adding to 1121204405 its reverse (5044021211), we get a palindrome (6165225616).

The spelling of 1121204405 in words is "one billion, one hundred twenty-one million, two hundred four thousand, four hundred five".