221210541 has 8 divisors (see below), whose sum is σ = 327719360. Its totient is φ = 147473676.

The previous prime is 221210491. The next prime is 221210543. The reversal of 221210541 is 145012122.

221210541 is a `hidden beast` number, since 2 + 2 + 121 + 0 + 541 = 666.

It is not a de Polignac number, because 221210541 - 2⁷ = 221210413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4096465 + ... + 4096518.

It is an arithmetic number, because the mean of its divisors is an integer number (40964920).

Almost surely, 2^221210541 is an apocalyptic number.

It is an amenable number.

221210541 is a deficient number, since it is larger than the sum of its proper divisors (106508819).

221210541 is an equidigital number, since it uses as much as digits as its factorization.

221210541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8192992 (or 8192986 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 221210541 is about 14873.1483217240. The cubic root of 221210541 is about 604.7862924819.

Adding to 221210541 its reverse (145012122), we get a palindrome (366222663).

The spelling of 221210541 in words is "two hundred twenty-one million, two hundred ten thousand, five hundred forty-one".