2440343021 has 2 divisors, whose sum is σ = 2440343022. Its totient is φ = 2440343020.

The previous prime is 2440342997. The next prime is 2440343023. The reversal of 2440343021 is 1203430442.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1498773796 + 941569225 = 38714^2 + 30685^2 .

It is a cyclic number.

It is not a de Polignac number, because 2440343021 - 2²² = 2436148717 is a prime.

Together with 2440343023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2440343023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1220171510 + 1220171511.

It is an arithmetic number, because the mean of its divisors is an integer number (1220171511).

Almost surely, 2^2440343021 is an apocalyptic number.

It is an amenable number.

2440343021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2440343021 is an equidigital number, since it uses as much as digits as its factorization.

2440343021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 2440343021 is about 49399.8281474744. The cubic root of 2440343021 is about 1346.3261834525.

Adding to 2440343021 its reverse (1203430442), we get a palindrome (3643773463).

The spelling of 2440343021 in words is "two billion, four hundred forty million, three hundred forty-three thousand, twenty-one".