421510023 has 12 divisors (see below), whose sum is σ = 664197768. Its totient is φ = 255460560.

The previous prime is 421510021. The next prime is 421510039. The reversal of 421510023 is 320015124.

It is not a de Polignac number, because 421510023 - 2¹ = 421510021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421509978 and 421510005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421510021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2128740 + ... + 2128937.

It is an arithmetic number, because the mean of its divisors is an integer number (55349814).

Almost surely, 2^421510023 is an apocalyptic number.

421510023 is a deficient number, since it is larger than the sum of its proper divisors (242687745).

421510023 is a wasteful number, since it uses less digits than its factorization.

421510023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257694 (or 4257691 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 421510023 is about 20530.7092668519. The cubic root of 421510023 is about 749.7836549324.

Adding to 421510023 its reverse (320015124), we get a palindrome (741525147).

The spelling of 421510023 in words is "four hundred twenty-one million, five hundred ten thousand, twenty-three".