315202221 has 6 divisors (see below), whose sum is σ = 455292110. Its totient is φ = 210134808.

The previous prime is 315202201. The next prime is 315202231. The reversal of 315202221 is 122202513.

It can be written as a sum of positive squares in only one way, i.e., 228432996 + 86769225 = 15114^2 + 9315^2 .

It is not a de Polignac number, because 315202221 - 2¹⁰ = 315201197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 315202194 and 315202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (315202201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17511226 + ... + 17511243.

Almost surely, 2^315202221 is an apocalyptic number.

It is an amenable number.

315202221 is a deficient number, since it is larger than the sum of its proper divisors (140089889).

315202221 is a wasteful number, since it uses less digits than its factorization.

315202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35022475 (or 35022472 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 315202221 is about 17753.9353665603. The cubic root of 315202221 is about 680.5547815404.

Adding to 315202221 its reverse (122202513), we get a palindrome (437404734).

The spelling of 315202221 in words is "three hundred fifteen million, two hundred two thousand, two hundred twenty-one".