316770021 has 20 divisors (see below), whose sum is σ = 474015564. Its totient is φ = 210816000.

The previous prime is 316770001. The next prime is 316770031. The reversal of 316770021 is 120077613.

It can be written as a sum of positive squares in 2 ways, for example, as 248062500 + 68707521 = 15750^2 + 8289^2 .

It is not a de Polignac number, because 316770021 - 2¹¹ = 316767973 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (316770001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48871 + ... + 54971.

Almost surely, 2^316770021 is an apocalyptic number.

It is an amenable number.

316770021 is a deficient number, since it is larger than the sum of its proper divisors (157245543).

316770021 is an equidigital number, since it uses as much as digits as its factorization.

316770021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6754 (or 6745 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 27.

The square root of 316770021 is about 17798.0341892019. The cubic root of 316770021 is about 681.6812643326.

The spelling of 316770021 in words is "three hundred sixteen million, seven hundred seventy thousand, twenty-one".