315150021 has 20 divisors (see below), whose sum is σ = 471355500. Its totient is φ = 209843136.

The previous prime is 315150019. The next prime is 315150037. The reversal of 315150021 is 120051513.

It can be written as a sum of positive squares in 2 ways, for example, as 193599396 + 121550625 = 13914^2 + 11025^2 .

It is not a de Polignac number, because 315150021 - 2¹ = 315150019 is a prime.

It is a super-3 number, since 3×315150021³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 315149976 and 315150003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315150091) 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, 83115 + ... + 86823.

It is an arithmetic number, because the mean of its divisors is an integer number (23567775).

Almost surely, 2^315150021 is an apocalyptic number.

It is an amenable number.

315150021 is a deficient number, since it is larger than the sum of its proper divisors (156205479).

315150021 is a wasteful number, since it uses less digits than its factorization.

315150021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4770 (or 4761 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 315150021 is about 17752.4652090914. The cubic root of 315150021 is about 680.5172110343.

The spelling of 315150021 in words is "three hundred fifteen million, one hundred fifty thousand, twenty-one".