1240441421 has 4 divisors (see below), whose sum is σ = 1249365600. Its totient is φ = 1231517244.

The previous prime is 1240441403. The next prime is 1240441441. The reversal of 1240441421 is 1241440421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1241440421 = 13 ⋅95495417.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1240441421 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 (1240441441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4461881 + ... + 4462158.

It is an arithmetic number, because the mean of its divisors is an integer number (312341400).

Almost surely, 2^1240441421 is an apocalyptic number.

It is an amenable number.

1240441421 is a deficient number, since it is larger than the sum of its proper divisors (8924179).

1240441421 is an equidigital number, since it uses as much as digits as its factorization.

1240441421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8924178.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 1240441421 is about 35219.9009226318. The cubic root of 1240441421 is about 1074.4645383766.

Adding to 1240441421 its reverse (1241440421), we get a palindrome (2481881842).

The spelling of 1240441421 in words is "one billion, two hundred forty million, four hundred forty-one thousand, four hundred twenty-one".