1240434340421 has 4 divisors (see below), whose sum is σ = 1252027184832. Its totient is φ = 1228841496012.

The previous prime is 1240434340403. The next prime is 1240434340441.

1240434340421 is nontrivially palindromic in base 10.

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.

It is a cyclic number.

It is not a de Polignac number, because 1240434340421 - 2¹⁸ = 1240434078277 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 (1240434340441) 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, 5796422045 + ... + 5796422258.

It is an arithmetic number, because the mean of its divisors is an integer number (313006796208).

Almost surely, 2^{1240434340421} is an apocalyptic number.

It is an amenable number.

1240434340421 is a deficient number, since it is larger than the sum of its proper divisors (11592844411).

1240434340421 is a wasteful number, since it uses less digits than its factorization.

1240434340421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11592844410.

The product of its (nonzero) digits is 36864, while the sum is 32.

The spelling of 1240434340421 in words is "one trillion, two hundred forty billion, four hundred thirty-four million, three hundred forty thousand, four hundred twenty-one".