421434523 has 2 divisors, whose sum is σ = 421434524. Its totient is φ = 421434522.

The previous prime is 421434479. The next prime is 421434547. The reversal of 421434523 is 325434124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421434523 - 2²¹ = 419337371 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421434491 and 421434500.

It is not a weakly prime, because it can be changed into another prime (421431523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210717261 + 210717262.

It is an arithmetic number, because the mean of its divisors is an integer number (210717262).

Almost surely, 2^421434523 is an apocalyptic number.

421434523 is a deficient number, since it is larger than the sum of its proper divisors (1).

421434523 is an equidigital number, since it uses as much as digits as its factorization.

421434523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11520, while the sum is 28.

The square root of 421434523 is about 20528.8704755035. The cubic root of 421434523 is about 749.7388856956.

Adding to 421434523 its reverse (325434124), we get a palindrome (746868647).

The spelling of 421434523 in words is "four hundred twenty-one million, four hundred thirty-four thousand, five hundred twenty-three".