421523143 has 4 divisors (see below), whose sum is σ = 446318640. Its totient is φ = 396727648.

The previous prime is 421523131. The next prime is 421523147. The reversal of 421523143 is 341325124.

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

It is a cyclic number.

It is not a de Polignac number, because 421523143 - 2⁵ = 421523111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421523147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12397723 + ... + 12397756.

It is an arithmetic number, because the mean of its divisors is an integer number (111579660).

Almost surely, 2^421523143 is an apocalyptic number.

421523143 is a deficient number, since it is larger than the sum of its proper divisors (24795497).

421523143 is a wasteful number, since it uses less digits than its factorization.

421523143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24795496.

The product of its digits is 2880, while the sum is 25.

The square root of 421523143 is about 20531.0287857185. The cubic root of 421523143 is about 749.7914341539.

Adding to 421523143 its reverse (341325124), we get a palindrome (762848267).

The spelling of 421523143 in words is "four hundred twenty-one million, five hundred twenty-three thousand, one hundred forty-three".