421302997 has 2 divisors, whose sum is σ = 421302998. Its totient is φ = 421302996.

The previous prime is 421302991. The next prime is 421303007. The reversal of 421302997 is 799203124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296735076 + 124567921 = 17226^2 + 11161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421302997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421302991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210651498 + 210651499.

It is an arithmetic number, because the mean of its divisors is an integer number (210651499).

Almost surely, 2^421302997 is an apocalyptic number.

It is an amenable number.

421302997 is a deficient number, since it is larger than the sum of its proper divisors (1).

421302997 is an equidigital number, since it uses as much as digits as its factorization.

421302997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 421302997 is about 20525.6667857588. Note that the first 3 decimals coincide. The cubic root of 421302997 is about 749.6608819476.

The spelling of 421302997 in words is "four hundred twenty-one million, three hundred two thousand, nine hundred ninety-seven".