2240342021 has 4 divisors (see below), whose sum is σ = 2248670700. Its totient is φ = 2232013344.

The previous prime is 2240342009. The next prime is 2240342029. The reversal of 2240342021 is 1202430422.

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 1353136225 + 887205796 = 36785^2 + 29786^2 .

It is a cyclic number.

It is not a de Polignac number, because 2240342021 - 2¹⁰ = 2240340997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2240341984 and 2240342002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2240342029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4163936 + ... + 4164473.

It is an arithmetic number, because the mean of its divisors is an integer number (562167675).

Almost surely, 2^2240342021 is an apocalyptic number.

It is an amenable number.

2240342021 is a deficient number, since it is larger than the sum of its proper divisors (8328679).

2240342021 is an equidigital number, since it uses as much as digits as its factorization.

2240342021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8328678.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 2240342021 is about 47332.2513831742. The cubic root of 2240342021 is about 1308.4931143394.

Adding to 2240342021 its reverse (1202430422), we get a palindrome (3442772443).

The spelling of 2240342021 in words is "two billion, two hundred forty million, three hundred forty-two thousand, twenty-one".