421333397 has 2 divisors, whose sum is σ = 421333398. Its totient is φ = 421333396.

The previous prime is 421333361. The next prime is 421333399. The reversal of 421333397 is 793333124.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 344139601 + 77193796 = 18551^2 + 8786^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421333397 is a prime.

Together with 421333399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421333399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210666698 + 210666699.

It is an arithmetic number, because the mean of its divisors is an integer number (210666699).

Almost surely, 2^421333397 is an apocalyptic number.

It is an amenable number.

421333397 is a deficient number, since it is larger than the sum of its proper divisors (1).

421333397 is an equidigital number, since it uses as much as digits as its factorization.

421333397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 35.

The square root of 421333397 is about 20526.4073086354. The cubic root of 421333397 is about 749.6789126309.

The spelling of 421333397 in words is "four hundred twenty-one million, three hundred thirty-three thousand, three hundred ninety-seven".