221540732 has 24 divisors (see below), whose sum is σ = 449326080. Its totient is φ = 93607920.

The previous prime is 221540701. The next prime is 221540771. The reversal of 221540732 is 237045122.

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, 53732 + ... + 57707.

It is an arithmetic number, because the mean of its divisors is an integer number (18721920).

Almost surely, 2^221540732 is an apocalyptic number.

It is an amenable number.

221540732 is an abundant number, since it is smaller than the sum of its proper divisors (227785348).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221540732 is a wasteful number, since it uses less digits than its factorization.

221540732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111521 (or 111519 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 221540732 is about 14884.2444215351. The cubic root of 221540732 is about 605.0870552960.

Adding to 221540732 its reverse (237045122), we get a palindrome (458585854).

The spelling of 221540732 in words is "two hundred twenty-one million, five hundred forty thousand, seven hundred thirty-two".