1121443021 has 4 divisors (see below), whose sum is σ = 1160113500. Its totient is φ = 1082772544.

The previous prime is 1121443019. The next prime is 1121443049. The reversal of 1121443021 is 1203441211.

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 217238121 + 904204900 = 14739^2 + 30070^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121443021 - 2¹ = 1121443019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1121443021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121444021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19335196 + ... + 19335253.

It is an arithmetic number, because the mean of its divisors is an integer number (290028375).

Almost surely, 2^1121443021 is an apocalyptic number.

It is an amenable number.

1121443021 is a deficient number, since it is larger than the sum of its proper divisors (38670479).

1121443021 is an equidigital number, since it uses as much as digits as its factorization.

1121443021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38670478.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1121443021 is about 33487.9533713244. The cubic root of 1121443021 is about 1038.9446336061.

Adding to 1121443021 its reverse (1203441211), we get a palindrome (2324884232).

The spelling of 1121443021 in words is "one billion, one hundred twenty-one million, four hundred forty-three thousand, twenty-one".