221440452 has 48 divisors (see below), whose sum is σ = 527929920. Its totient is φ = 72220672.

The previous prime is 221440447. The next prime is 221440469. The reversal of 221440452 is 254044122.

It is a happy number.

221440452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 181348 + ... + 182564.

It is an arithmetic number, because the mean of its divisors is an integer number (10998540).

Almost surely, 2^221440452 is an apocalyptic number.

It is an amenable number.

221440452 is an abundant number, since it is smaller than the sum of its proper divisors (306489468).

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

221440452 is a wasteful number, since it uses less digits than its factorization.

221440452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1540 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 24.

The square root of 221440452 is about 14880.8753774770. The cubic root of 221440452 is about 604.9957443409.

Adding to 221440452 its reverse (254044122), we get a palindrome (475484574).

The spelling of 221440452 in words is "two hundred twenty-one million, four hundred forty thousand, four hundred fifty-two".