221630115 has 16 divisors (see below), whose sum is σ = 405266688. Its totient is φ = 101316576.

The previous prime is 221630089. The next prime is 221630219. The reversal of 221630115 is 511036122.

It is not a de Polignac number, because 221630115 - 2¹⁴ = 221613731 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 221630091 and 221630100.

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, 1055277 + ... + 1055486.

It is an arithmetic number, because the mean of its divisors is an integer number (25329168).

Almost surely, 2^221630115 is an apocalyptic number.

221630115 is a deficient number, since it is larger than the sum of its proper divisors (183636573).

221630115 is a wasteful number, since it uses less digits than its factorization.

221630115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2110778.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 221630115 is about 14887.2467232863. The cubic root of 221630115 is about 605.1684206560.

Adding to 221630115 its reverse (511036122), we get a palindrome (732666237).

The spelling of 221630115 in words is "two hundred twenty-one million, six hundred thirty thousand, one hundred fifteen".