221440534 has 16 divisors (see below), whose sum is σ = 380678400. Its totient is φ = 94636584.

The previous prime is 221440517. The next prime is 221440567. The reversal of 221440534 is 435044122.

It is a happy number.

221440534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 221440499 and 221440508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17004 + ... + 27055.

It is an arithmetic number, because the mean of its divisors is an integer number (23792400).

Almost surely, 2^221440534 is an apocalyptic number.

221440534 is a deficient number, since it is larger than the sum of its proper divisors (159237866).

221440534 is a wasteful number, since it uses less digits than its factorization.

221440534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44427.

The product of its (nonzero) digits is 3840, while the sum is 25.

The square root of 221440534 is about 14880.8781326910. The cubic root of 221440534 is about 604.9958190181.

Adding to 221440534 its reverse (435044122), we get a palindrome (656484656).

The spelling of 221440534 in words is "two hundred twenty-one million, four hundred forty thousand, five hundred thirty-four".