421916423 has 2 divisors, whose sum is σ = 421916424. Its totient is φ = 421916422.

The previous prime is 421916381. The next prime is 421916441. The reversal of 421916423 is 324619124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421916423 - 2⁶ = 421916359 is a prime.

It is a super-2 number, since 2×421916423² = 356026935994229858, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 421916423.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421916483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210958211 + 210958212.

It is an arithmetic number, because the mean of its divisors is an integer number (210958212).

Almost surely, 2^421916423 is an apocalyptic number.

421916423 is a deficient number, since it is larger than the sum of its proper divisors (1).

421916423 is an equidigital number, since it uses as much as digits as its factorization.

421916423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 32.

The square root of 421916423 is about 20540.6042510925. The cubic root of 421916423 is about 750.0245461596.

The spelling of 421916423 in words is "four hundred twenty-one million, nine hundred sixteen thousand, four hundred twenty-three".