221355532 has 6 divisors (see below), whose sum is σ = 387372188. Its totient is φ = 110677764.

The previous prime is 221355509. The next prime is 221355553. The reversal of 221355532 is 235553122.

It is a self number, because there is not a number n which added to its sum of digits gives 221355532.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27669438 + ... + 27669445.

Almost surely, 2^221355532 is an apocalyptic number.

It is an amenable number.

221355532 is a deficient number, since it is larger than the sum of its proper divisors (166016656).

221355532 is a wasteful number, since it uses less digits than its factorization.

221355532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55338887 (or 55338885 counting only the distinct ones).

The product of its digits is 9000, while the sum is 28.

The square root of 221355532 is about 14878.0217771046. The cubic root of 221355532 is about 604.9183980281.

The spelling of 221355532 in words is "two hundred twenty-one million, three hundred fifty-five thousand, five hundred thirty-two".