316224821 has 4 divisors (see below), whose sum is σ = 344972544. Its totient is φ = 287477100.

The previous prime is 316224817. The next prime is 316224823. The reversal of 316224821 is 128422613.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 128422613 = 11 ⋅11674783.

It is a cyclic number.

It is not a de Polignac number, because 316224821 - 2² = 316224817 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 (316224823) 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, 14373845 + ... + 14373866.

It is an arithmetic number, because the mean of its divisors is an integer number (86243136).

Almost surely, 2^316224821 is an apocalyptic number.

It is an amenable number.

316224821 is a deficient number, since it is larger than the sum of its proper divisors (28747723).

316224821 is a wasteful number, since it uses less digits than its factorization.

316224821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28747722.

The product of its digits is 4608, while the sum is 29.

The square root of 316224821 is about 17782.7112949629. The cubic root of 316224821 is about 681.2899541026.

The spelling of 316224821 in words is "three hundred sixteen million, two hundred twenty-four thousand, eight hundred twenty-one".