221681115 has 12 divisors (see below), whose sum is σ = 384247344. Its totient is φ = 118229904.

The previous prime is 221681087. The next prime is 221681123. The reversal of 221681115 is 511186122.

It is not a de Polignac number, because 221681115 - 2⁶ = 221681051 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2463079 + ... + 2463168.

It is an arithmetic number, because the mean of its divisors is an integer number (32020612).

Almost surely, 2^221681115 is an apocalyptic number.

221681115 is a deficient number, since it is larger than the sum of its proper divisors (162566229).

221681115 is a wasteful number, since it uses less digits than its factorization.

221681115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4926258 (or 4926255 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 221681115 is about 14888.9595002472. The cubic root of 221681115 is about 605.2148361629.

The spelling of 221681115 in words is "two hundred twenty-one million, six hundred eighty-one thousand, one hundred fifteen".