221131066 has 16 divisors (see below), whose sum is σ = 357583464. Its totient is φ = 101954304.

The previous prime is 221130977. The next prime is 221131073. The reversal of 221131066 is 660131122.

221131066 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 4 ways, for example, as 196420225 + 24710841 = 14015^2 + 4971^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24646 + ... + 32398.

Almost surely, 2^221131066 is an apocalyptic number.

221131066 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

221131066 is a deficient number, since it is larger than the sum of its proper divisors (136452398).

221131066 is a wasteful number, since it uses less digits than its factorization.

221131066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8865.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 221131066 is about 14870.4763205487. The cubic root of 221131066 is about 604.7138559881.

Adding to 221131066 its reverse (660131122), we get a palindrome (881262188).

The spelling of 221131066 in words is "two hundred twenty-one million, one hundred thirty-one thousand, sixty-six".