523216421 has 8 divisors (see below), whose sum is σ = 643958784. Its totient is φ = 413973360.

The previous prime is 523216409. The next prime is 523216439. The reversal of 523216421 is 124612325.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 523216421 - 2¹⁰ = 523215397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523216451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2874725 + ... + 2874906.

It is an arithmetic number, because the mean of its divisors is an integer number (80494848).

Almost surely, 2^523216421 is an apocalyptic number.

It is an amenable number.

523216421 is a deficient number, since it is larger than the sum of its proper divisors (120742363).

523216421 is a wasteful number, since it uses less digits than its factorization.

523216421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5749651.

The product of its digits is 2880, while the sum is 26.

The square root of 523216421 is about 22873.9244774481. The cubic root of 523216421 is about 805.7997381275.

Adding to 523216421 its reverse (124612325), we get a palindrome (647828746).

The spelling of 523216421 in words is "five hundred twenty-three million, two hundred sixteen thousand, four hundred twenty-one".