1121511421 has 4 divisors (see below), whose sum is σ = 1121804572. Its totient is φ = 1121218272.

The previous prime is 1121511401. The next prime is 1121511431. The reversal of 1121511421 is 1241151211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1241151211 = 9689 ⋅128099.

It can be written as a sum of positive squares in 2 ways, for example, as 704902500 + 416608921 = 26550^2 + 20411^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121511421 - 2⁵ = 1121511389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121511401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140760 + ... + 148513.

It is an arithmetic number, because the mean of its divisors is an integer number (280451143).

Almost surely, 2^1121511421 is an apocalyptic number.

It is an amenable number.

1121511421 is a deficient number, since it is larger than the sum of its proper divisors (293151).

1121511421 is an equidigital number, since it uses as much as digits as its factorization.

1121511421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293150.

The product of its digits is 80, while the sum is 19.

The square root of 1121511421 is about 33488.9746185218. The cubic root of 1121511421 is about 1038.9657559062.

Adding to 1121511421 its reverse (1241151211), we get a palindrome (2362662632).

The spelling of 1121511421 in words is "one billion, one hundred twenty-one million, five hundred eleven thousand, four hundred twenty-one".