521202423 has 16 divisors (see below), whose sum is σ = 803139840. Its totient is φ = 294482496.

The previous prime is 521202403. The next prime is 521202427. The reversal of 521202423 is 324202125.

It is not a de Polignac number, because 521202423 - 2⁶ = 521202359 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 521202423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521202427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137565 + ... + 141302.

It is an arithmetic number, because the mean of its divisors is an integer number (50196240).

Almost surely, 2^521202423 is an apocalyptic number.

521202423 is a deficient number, since it is larger than the sum of its proper divisors (281937417).

521202423 is a wasteful number, since it uses less digits than its factorization.

521202423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278966.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 521202423 is about 22829.8581467341. The cubic root of 521202423 is about 804.7644967776.

Adding to 521202423 its reverse (324202125), we get a palindrome (845404548).

The spelling of 521202423 in words is "five hundred twenty-one million, two hundred two thousand, four hundred twenty-three".