421564043023 has 4 divisors (see below), whose sum is σ = 421754539608. Its totient is φ = 421373546440.

The previous prime is 421564043003. The next prime is 421564043039. The reversal of 421564043023 is 320340465124.

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 421564043023 - 2³⁷ = 284125089551 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421564043023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421564043003) 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, 95244973 + ... + 95249398.

It is an arithmetic number, because the mean of its divisors is an integer number (105438634902).

Almost surely, 2^421564043023 is an apocalyptic number.

421564043023 is a deficient number, since it is larger than the sum of its proper divisors (190496585).

421564043023 is a wasteful number, since it uses less digits than its factorization.

421564043023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190496584.

The product of its (nonzero) digits is 69120, while the sum is 34.

The spelling of 421564043023 in words is "four hundred twenty-one billion, five hundred sixty-four million, forty-three thousand, twenty-three".