221045266 has 16 divisors (see below), whose sum is σ = 357344064. Its totient is φ = 101943504.

The previous prime is 221045263. The next prime is 221045281. The reversal of 221045266 is 662540122.

221045266 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221045266² = 97722019242021512, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221045263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45721 + ... + 50323.

It is an arithmetic number, because the mean of its divisors is an integer number (22334004).

Almost surely, 2^221045266 is an apocalyptic number.

221045266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221045266 is a deficient number, since it is larger than the sum of its proper divisors (136298798).

221045266 is a wasteful number, since it uses less digits than its factorization.

221045266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6465.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 221045266 is about 14867.5911297022. The cubic root of 221045266 is about 604.6356351668.

Adding to 221045266 its reverse (662540122), we get a palindrome (883585388).

The spelling of 221045266 in words is "two hundred twenty-one million, forty-five thousand, two hundred sixty-six".