421866997 has 2 divisors, whose sum is σ = 421866998. Its totient is φ = 421866996.

The previous prime is 421866947. The next prime is 421867027. The reversal of 421866997 is 799668124.

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., 421645156 + 221841 = 20534^2 + 471^2 .

It is a cyclic number.

It is not a de Polignac number, because 421866997 - 2⁷ = 421866869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421866947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210933498 + 210933499.

It is an arithmetic number, because the mean of its divisors is an integer number (210933499).

Almost surely, 2^421866997 is an apocalyptic number.

It is an amenable number.

421866997 is a deficient number, since it is larger than the sum of its proper divisors (1).

421866997 is an equidigital number, since it uses as much as digits as its factorization.

421866997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 421866997 is about 20539.4010866919. The cubic root of 421866997 is about 749.9952574515.

The spelling of 421866997 in words is "four hundred twenty-one million, eight hundred sixty-six thousand, nine hundred ninety-seven".