1234042421 has 2 divisors, whose sum is σ = 1234042422. Its totient is φ = 1234042420.

The previous prime is 1234042379. The next prime is 1234042441. The reversal of 1234042421 is 1242404321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 979001521 + 255040900 = 31289^2 + 15970^2 .

It is an emirp because it is prime and its reverse (1242404321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1234042421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1234042441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617021210 + 617021211.

It is an arithmetic number, because the mean of its divisors is an integer number (617021211).

Almost surely, 2^1234042421 is an apocalyptic number.

It is an amenable number.

1234042421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1234042421 is an equidigital number, since it uses as much as digits as its factorization.

1234042421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1234042421 is about 35128.9399356143. The cubic root of 1234042421 is about 1072.6137576189.

Adding to 1234042421 its reverse (1242404321), we get a palindrome (2476446742).

The spelling of 1234042421 in words is "one billion, two hundred thirty-four million, forty-two thousand, four hundred twenty-one".