421244023 has 4 divisors (see below), whose sum is σ = 421632640. Its totient is φ = 420855408.

The previous prime is 421244017. The next prime is 421244029. The reversal of 421244023 is 320442124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (421244017) and next prime (421244029).

It is a cyclic number.

It is not a de Polignac number, because 421244023 - 2¹³ = 421235831 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421243985 and 421244003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421244029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192678 + ... + 194851.

It is an arithmetic number, because the mean of its divisors is an integer number (105408160).

Almost surely, 2^421244023 is an apocalyptic number.

421244023 is a deficient number, since it is larger than the sum of its proper divisors (388617).

421244023 is a wasteful number, since it uses less digits than its factorization.

421244023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388616.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 421244023 is about 20524.2301439055. The cubic root of 421244023 is about 749.6259011348.

Adding to 421244023 its reverse (320442124), we get a palindrome (741686147).

The spelling of 421244023 in words is "four hundred twenty-one million, two hundred forty-four thousand, twenty-three".