221540534 has 8 divisors (see below), whose sum is σ = 341292288. Its totient is φ = 107776440.

The previous prime is 221540533. The next prime is 221540591. The reversal of 221540534 is 435045122.

It is a happy number.

221540534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221540533) 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, 1496822 + ... + 1496969.

It is an arithmetic number, because the mean of its divisors is an integer number (42661536).

Almost surely, 2^221540534 is an apocalyptic number.

221540534 is a deficient number, since it is larger than the sum of its proper divisors (119751754).

221540534 is a wasteful number, since it uses less digits than its factorization.

221540534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2993830.

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 221540534 is about 14884.2377702051. The cubic root of 221540534 is about 605.0868750323.

Adding to 221540534 its reverse (435045122), we get a palindrome (656585656).

The spelling of 221540534 in words is "two hundred twenty-one million, five hundred forty thousand, five hundred thirty-four".