1133240021 has 4 divisors (see below), whose sum is σ = 1136278572. Its totient is φ = 1130201472.

The previous prime is 1133239981. The next prime is 1133240023. The reversal of 1133240021 is 1200423311.

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 437019025 + 696220996 = 20905^2 + 26386^2 .

It is a cyclic number.

It is not a de Polignac number, because 1133240021 - 2⁶ = 1133239957 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 (1133240023) 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, 1518716 + ... + 1519461.

It is an arithmetic number, because the mean of its divisors is an integer number (284069643).

Almost surely, 2^1133240021 is an apocalyptic number.

It is an amenable number.

1133240021 is a deficient number, since it is larger than the sum of its proper divisors (3038551).

1133240021 is an equidigital number, since it uses as much as digits as its factorization.

1133240021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3038550.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1133240021 is about 33663.6305380154. The cubic root of 1133240021 is about 1042.5749866221.

Adding to 1133240021 its reverse (1200423311), we get a palindrome (2333663332).

The spelling of 1133240021 in words is "one billion, one hundred thirty-three million, two hundred forty thousand, twenty-one".