221270091 has 8 divisors (see below), whose sum is σ = 337173504. Its totient is φ = 126440040.

The previous prime is 221270089. The next prime is 221270107. The reversal of 221270091 is 190072122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221270091 - 2¹ = 221270089 is a prime.

It is a super-2 number, since 2×221270091² = 97920906342296562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221270041) by changing a digit.

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, 5268315 + ... + 5268356.

It is an arithmetic number, because the mean of its divisors is an integer number (42146688).

Almost surely, 2^221270091 is an apocalyptic number.

221270091 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221270091 is a deficient number, since it is larger than the sum of its proper divisors (115903413).

221270091 is a wasteful number, since it uses less digits than its factorization.

221270091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10536681.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 221270091 is about 14875.1501168896. The cubic root of 221270091 is about 604.8405572143.

The spelling of 221270091 in words is "two hundred twenty-one million, two hundred seventy thousand, ninety-one".