221252066 has 16 divisors (see below), whose sum is σ = 379800960. Its totient is φ = 94694400.

The previous prime is 221252039. The next prime is 221252081. The reversal of 221252066 is 660252122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491 + ... + 21041.

It is an arithmetic number, because the mean of its divisors is an integer number (23737560).

Almost surely, 2^221252066 is an apocalyptic number.

221252066 is a deficient number, since it is larger than the sum of its proper divisors (158548894).

221252066 is a wasteful number, since it uses less digits than its factorization.

221252066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21329.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 221252066 is about 14874.5442283117. The cubic root of 221252066 is about 604.8241330227.

The spelling of 221252066 in words is "two hundred twenty-one million, two hundred fifty-two thousand, sixty-six".