221540452 has 12 divisors (see below), whose sum is σ = 443080960. Its totient is φ = 94945896.

The previous prime is 221540443. The next prime is 221540479. The reversal of 221540452 is 254045122.

221540452 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3956052 + ... + 3956107.

Almost surely, 2^221540452 is an apocalyptic number.

It is an amenable number.

221540452 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221540452 is a wasteful number, since it uses less digits than its factorization.

221540452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7912170 (or 7912168 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

The square root of 221540452 is about 14884.2350156130. The cubic root of 221540452 is about 605.0868003776.

Adding to 221540452 its reverse (254045122), we get a palindrome (475585574).

The spelling of 221540452 in words is "two hundred twenty-one million, five hundred forty thousand, four hundred fifty-two".