421700023 has 2 divisors, whose sum is σ = 421700024. Its totient is φ = 421700022.

The previous prime is 421700017. The next prime is 421700029. The reversal of 421700023 is 320007124.

It is a balanced prime because it is at equal distance from previous prime (421700017) and next prime (421700029).

It is a cyclic number.

It is not a de Polignac number, because 421700023 - 2²⁵ = 388145591 is a prime.

It is equal to p_22430125 and since 421700023 and 22430125 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (421700029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210850011 + 210850012.

It is an arithmetic number, because the mean of its divisors is an integer number (210850012).

Almost surely, 2^421700023 is an apocalyptic number.

421700023 is a deficient number, since it is larger than the sum of its proper divisors (1).

421700023 is an equidigital number, since it uses as much as digits as its factorization.

421700023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 421700023 is about 20535.3359602418. The cubic root of 421700023 is about 749.8962955871.

Adding to 421700023 its reverse (320007124), we get a palindrome (741707147).

The spelling of 421700023 in words is "four hundred twenty-one million, seven hundred thousand, twenty-three".