221034191 has 16 divisors (see below), whose sum is σ = 256198656. Its totient is φ = 186782976.

The previous prime is 221034137. The next prime is 221034211. The reversal of 221034191 is 191430122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221034191 is a prime.

It is a super-2 number, since 2×221034191² = 97712227182048962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221034691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 248750 + ... + 249636.

It is an arithmetic number, because the mean of its divisors is an integer number (16012416).

Almost surely, 2^221034191 is an apocalyptic number.

221034191 is a deficient number, since it is larger than the sum of its proper divisors (35164465).

221034191 is an equidigital number, since it uses as much as digits as its factorization.

221034191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 221034191 is about 14867.2186706189. The cubic root of 221034191 is about 604.6255370067.

The spelling of 221034191 in words is "two hundred twenty-one million, thirty-four thousand, one hundred ninety-one".