421434253 has 2 divisors, whose sum is σ = 421434254. Its totient is φ = 421434252.

The previous prime is 421434241. The next prime is 421434281. The reversal of 421434253 is 352434124.

It is a happy number.

It is an a-pointer prime, because the next prime (421434281) can be obtained adding 421434253 to its sum of digits (28).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 416690569 + 4743684 = 20413^2 + 2178^2 .

It is a cyclic number.

It is not a de Polignac number, because 421434253 - 2⁹ = 421433741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421431253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210717126 + 210717127.

It is an arithmetic number, because the mean of its divisors is an integer number (210717127).

Almost surely, 2^421434253 is an apocalyptic number.

It is an amenable number.

421434253 is a deficient number, since it is larger than the sum of its proper divisors (1).

421434253 is an equidigital number, since it uses as much as digits as its factorization.

421434253 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 421434253 is about 20528.8638993978. The cubic root of 421434253 is about 749.7387255841.

Adding to 421434253 its reverse (352434124), we get a palindrome (773868377).

The spelling of 421434253 in words is "four hundred twenty-one million, four hundred thirty-four thousand, two hundred fifty-three".