315221420 has 48 divisors (see below), whose sum is σ = 672084000. Its totient is φ = 124177920.

The previous prime is 315221377. The next prime is 315221437. The reversal of 315221420 is 24122513.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 315221392 and 315221401.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 413840 + ... + 414600.

It is an arithmetic number, because the mean of its divisors is an integer number (14001750).

Almost surely, 2^315221420 is an apocalyptic number.

It is an amenable number.

315221420 is an abundant number, since it is smaller than the sum of its proper divisors (356862580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

315221420 is a wasteful number, since it uses less digits than its factorization.

315221420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1058 (or 1056 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 315221420 is about 17754.4760553501. The cubic root of 315221420 is about 680.5685988140.

Adding to 315221420 its reverse (24122513), we get a palindrome (339343933).

The spelling of 315221420 in words is "three hundred fifteen million, two hundred twenty-one thousand, four hundred twenty".