221825534 has 16 divisors (see below), whose sum is σ = 380572128. Its totient is φ = 94993152.

The previous prime is 221825533. The next prime is 221825561. The reversal of 221825534 is 435528122.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221825534.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221825533) 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 7 ways as a sum of consecutive naturals, for example, 14534 + ... + 25590.

It is an arithmetic number, because the mean of its divisors is an integer number (23785758).

Almost surely, 2^221825534 is an apocalyptic number.

221825534 is a deficient number, since it is larger than the sum of its proper divisors (158746594).

221825534 is a wasteful number, since it uses less digits than its factorization.

221825534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12499.

The product of its digits is 19200, while the sum is 32.

The square root of 221825534 is about 14893.8085794064. The cubic root of 221825534 is about 605.3462344370.

The spelling of 221825534 in words is "two hundred twenty-one million, eight hundred twenty-five thousand, five hundred thirty-four".