221131315 has 16 divisors (see below), whose sum is σ = 277353216. Its totient is φ = 168933600.

The previous prime is 221131307. The next prime is 221131321. The reversal of 221131315 is 513131122.

221131315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221131315 - 2³ = 221131307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221131292 and 221131301.

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, 92080 + ... + 94450.

It is an arithmetic number, because the mean of its divisors is an integer number (17334576).

Almost surely, 2^221131315 is an apocalyptic number.

221131315 is a deficient number, since it is larger than the sum of its proper divisors (56221901).

221131315 is a wasteful number, since it uses less digits than its factorization.

221131315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210.

The product of its digits is 180, while the sum is 19.

The square root of 221131315 is about 14870.4846928404. The cubic root of 221131315 is about 604.7140829631.

Adding to 221131315 its reverse (513131122), we get a palindrome (734262437).

The spelling of 221131315 in words is "two hundred twenty-one million, one hundred thirty-one thousand, three hundred fifteen".