221234541 has 16 divisors (see below), whose sum is σ = 324986688. Its totient is φ = 132752000.

The previous prime is 221234501. The next prime is 221234543. The reversal of 221234541 is 145432122.

It is a cyclic number.

It is not a de Polignac number, because 221234541 - 2²² = 217040237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221234543) 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, 29856 + ... + 36521.

It is an arithmetic number, because the mean of its divisors is an integer number (20311668).

Almost surely, 2^221234541 is an apocalyptic number.

It is an amenable number.

221234541 is a deficient number, since it is larger than the sum of its proper divisors (103752147).

221234541 is a wasteful number, since it uses less digits than its factorization.

221234541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66492.

The product of its digits is 1920, while the sum is 24.

The square root of 221234541 is about 14873.9551229658. The cubic root of 221234541 is about 604.8081635707.

Adding to 221234541 its reverse (145432122), we get a palindrome (366666663).

The spelling of 221234541 in words is "two hundred twenty-one million, two hundred thirty-four thousand, five hundred forty-one".