221221096 has 16 divisors (see below), whose sum is σ = 417083940. Its totient is φ = 109998720.

The previous prime is 221221087. The next prime is 221221097. The reversal of 221221096 is 690122122.

221221096 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 185340996 + 35880100 = 13614^2 + 5990^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221221096.

It is not an unprimeable number, because it can be changed into a prime (221221097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74941 + ... + 77836.

Almost surely, 2^221221096 is an apocalyptic number.

It is an amenable number.

221221096 is a deficient number, since it is larger than the sum of its proper divisors (195862844).

221221096 is a wasteful number, since it uses less digits than its factorization.

221221096 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152964 (or 152960 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 221221096 is about 14873.5031515780. The cubic root of 221221096 is about 604.7959113993.

The spelling of 221221096 in words is "two hundred twenty-one million, two hundred twenty-one thousand, ninety-six".