421131253 has 2 divisors, whose sum is σ = 421131254. Its totient is φ = 421131252.

The previous prime is 421131209. The next prime is 421131283. The reversal of 421131253 is 352131124.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 408120804 + 13010449 = 20202^2 + 3607^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421131253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421131283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210565626 + 210565627.

It is an arithmetic number, because the mean of its divisors is an integer number (210565627).

Almost surely, 2^421131253 is an apocalyptic number.

It is an amenable number.

421131253 is a deficient number, since it is larger than the sum of its proper divisors (1).

421131253 is an equidigital number, since it uses as much as digits as its factorization.

421131253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 22.

The square root of 421131253 is about 20521.4827193359. The cubic root of 421131253 is about 749.5590017820.

Adding to 421131253 its reverse (352131124), we get a palindrome (773262377).

The spelling of 421131253 in words is "four hundred twenty-one million, one hundred thirty-one thousand, two hundred fifty-three".