316421021 has 8 divisors (see below), whose sum is σ = 361884864. Its totient is φ = 271022400.

The previous prime is 316421011. The next prime is 316421023. The reversal of 316421021 is 120124613.

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 316421021 - 2⁶ = 316420957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 316420984 and 316421002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316421023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5420 + ... + 25733.

It is an arithmetic number, because the mean of its divisors is an integer number (45235608).

Almost surely, 2^316421021 is an apocalyptic number.

It is an amenable number.

316421021 is a deficient number, since it is larger than the sum of its proper divisors (45463843).

316421021 is a wasteful number, since it uses less digits than its factorization.

316421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32611.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 316421021 is about 17788.2270336310. The cubic root of 316421021 is about 681.4308258758.

Adding to 316421021 its reverse (120124613), we get a palindrome (436545634).

The spelling of 316421021 in words is "three hundred sixteen million, four hundred twenty-one thousand, twenty-one".