421274197 has 2 divisors, whose sum is σ = 421274198. Its totient is φ = 421274196.

The previous prime is 421274177. The next prime is 421274237. The reversal of 421274197 is 791472124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 406788561 + 14485636 = 20169^2 + 3806^2 .

It is a cyclic number.

It is not a de Polignac number, because 421274197 - 2¹⁹ = 420749909 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421274177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210637098 + 210637099.

It is an arithmetic number, because the mean of its divisors is an integer number (210637099).

Almost surely, 2^421274197 is an apocalyptic number.

It is an amenable number.

421274197 is a deficient number, since it is larger than the sum of its proper divisors (1).

421274197 is an equidigital number, since it uses as much as digits as its factorization.

421274197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The square root of 421274197 is about 20524.9652131252. The cubic root of 421274197 is about 749.6437994476.

The spelling of 421274197 in words is "four hundred twenty-one million, two hundred seventy-four thousand, one hundred ninety-seven".