221545532 has 24 divisors (see below), whose sum is σ = 417988032. Its totient is φ = 102139200.

The previous prime is 221545517. The next prime is 221545537. The reversal of 221545532 is 235545122.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 221545495 and 221545504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221545537) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62282 + ... + 65742.

It is an arithmetic number, because the mean of its divisors is an integer number (17416168).

Almost surely, 2^221545532 is an apocalyptic number.

It is an amenable number.

221545532 is a deficient number, since it is larger than the sum of its proper divisors (196442500).

221545532 is a wasteful number, since it uses less digits than its factorization.

221545532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4709 (or 4707 counting only the distinct ones).

The product of its digits is 12000, while the sum is 29.

The square root of 221545532 is about 14884.4056649905. The cubic root of 221545532 is about 605.0914252928.

The spelling of 221545532 in words is "two hundred twenty-one million, five hundred forty-five thousand, five hundred thirty-two".