221034161 has 4 divisors (see below), whose sum is σ = 221334000. Its totient is φ = 220734324.

The previous prime is 221034137. The next prime is 221034211. The reversal of 221034161 is 161430122.

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 a cyclic number.

It is not a de Polignac number, because 221034161 - 2⁶ = 221034097 is a prime.

It is a super-2 number, since 2×221034161² = 97712200657947842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221034461) 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, 148811 + ... + 150288.

It is an arithmetic number, because the mean of its divisors is an integer number (55333500).

Almost surely, 2^221034161 is an apocalyptic number.

It is an amenable number.

221034161 is a deficient number, since it is larger than the sum of its proper divisors (299839).

221034161 is an equidigital number, since it uses as much as digits as its factorization.

221034161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299838.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 221034161 is about 14867.2176616877. The cubic root of 221034161 is about 604.6255096523.

Adding to 221034161 its reverse (161430122), we get a palindrome (382464283).

The spelling of 221034161 in words is "two hundred twenty-one million, thirty-four thousand, one hundred sixty-one".