221540533 has 2 divisors, whose sum is σ = 221540534. Its totient is φ = 221540532.

The previous prime is 221540479. The next prime is 221540591. The reversal of 221540533 is 335045122.

221540533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171950769 + 49589764 = 13113^2 + 7042^2 .

It is a cyclic number.

It is not a de Polignac number, because 221540533 - 2⁹ = 221540021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221540498 and 221540507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221540633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110770266 + 110770267.

It is an arithmetic number, because the mean of its divisors is an integer number (110770267).

Almost surely, 2^221540533 is an apocalyptic number.

It is an amenable number.

221540533 is a deficient number, since it is larger than the sum of its proper divisors (1).

221540533 is an equidigital number, since it uses as much as digits as its factorization.

221540533 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 221540533 is about 14884.2377366125. The cubic root of 221540533 is about 605.0868741218.

Adding to 221540533 its reverse (335045122), we get a palindrome (556585655).

The spelling of 221540533 in words is "two hundred twenty-one million, five hundred forty thousand, five hundred thirty-three".