434521421 has 2 divisors, whose sum is σ = 434521422. Its totient is φ = 434521420.

The previous prime is 434521391. The next prime is 434521427. The reversal of 434521421 is 124125434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434514025 + 7396 = 20845^2 + 86^2 .

It is a cyclic number.

It is not a de Polignac number, because 434521421 - 2¹⁴ = 434505037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (434521427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 217260710 + 217260711.

It is an arithmetic number, because the mean of its divisors is an integer number (217260711).

Almost surely, 2^434521421 is an apocalyptic number.

It is an amenable number.

434521421 is a deficient number, since it is larger than the sum of its proper divisors (1).

434521421 is an equidigital number, since it uses as much as digits as its factorization.

434521421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3840, while the sum is 26.

The square root of 434521421 is about 20845.1774038985. The cubic root of 434521421 is about 757.4205145570.

Adding to 434521421 its reverse (124125434), we get a palindrome (558646855).

The spelling of 434521421 in words is "four hundred thirty-four million, five hundred twenty-one thousand, four hundred twenty-one".