221266081 has 4 divisors (see below), whose sum is σ = 221710000. Its totient is φ = 220822164.

The previous prime is 221266063. The next prime is 221266099. The reversal of 221266081 is 180662122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (221266063) and next prime (221266099).

It is a cyclic number.

It is not a de Polignac number, because 221266081 - 2⁷ = 221265953 is a prime.

It is a super-2 number, since 2×221266081² = 97917357202197122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221266061) 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, 221211 + ... + 222208.

It is an arithmetic number, because the mean of its divisors is an integer number (55427500).

Almost surely, 2^221266081 is an apocalyptic number.

It is an amenable number.

221266081 is a deficient number, since it is larger than the sum of its proper divisors (443919).

221266081 is an equidigital number, since it uses as much as digits as its factorization.

221266081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443918.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 221266081 is about 14875.0153277232. The cubic root of 221266081 is about 604.8369034214.

The spelling of 221266081 in words is "two hundred twenty-one million, two hundred sixty-six thousand, eighty-one".