421535140023 has 4 divisors (see below), whose sum is σ = 562046853368. Its totient is φ = 281023426680.

The previous prime is 421535139979. The next prime is 421535140063. The reversal of 421535140023 is 320041535124.

421535140023 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 421535140023 - 2²¹ = 421533042871 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 (421535140063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70255856668 + ... + 70255856673.

It is an arithmetic number, because the mean of its divisors is an integer number (140511713342).

Almost surely, 2^421535140023 is an apocalyptic number.

421535140023 is a deficient number, since it is larger than the sum of its proper divisors (140511713345).

421535140023 is a wasteful number, since it uses less digits than its factorization.

421535140023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140511713344.

The product of its (nonzero) digits is 14400, while the sum is 30.

Adding to 421535140023 its reverse (320041535124), we get a palindrome (741576675147).

The spelling of 421535140023 in words is "four hundred twenty-one billion, five hundred thirty-five million, one hundred forty thousand, twenty-three".