421603253 has 2 divisors, whose sum is σ = 421603254. Its totient is φ = 421603252.

The previous prime is 421603211. The next prime is 421603279. The reversal of 421603253 is 352306124.

It is an a-pointer prime, because the next prime (421603279) can be obtained adding 421603253 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371448529 + 50154724 = 19273^2 + 7082^2 .

It is a cyclic number.

It is not a de Polignac number, because 421603253 - 2⁸ = 421602997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421603283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210801626 + 210801627.

It is an arithmetic number, because the mean of its divisors is an integer number (210801627).

Almost surely, 2^421603253 is an apocalyptic number.

It is an amenable number.

421603253 is a deficient number, since it is larger than the sum of its proper divisors (1).

421603253 is an equidigital number, since it uses as much as digits as its factorization.

421603253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 421603253 is about 20532.9796425166. The cubic root of 421603253 is about 749.8389301519.

Adding to 421603253 its reverse (352306124), we get a palindrome (773909377).

The spelling of 421603253 in words is "four hundred twenty-one million, six hundred three thousand, two hundred fifty-three".