221311052 has 12 divisors (see below), whose sum is σ = 387725856. Its totient is φ = 110532240.

The previous prime is 221311043. The next prime is 221311091. The reversal of 221311052 is 250113122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221311052.

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, 26723 + ... + 34010.

It is an arithmetic number, because the mean of its divisors is an integer number (32310488).

Almost surely, 2^221311052 is an apocalyptic number.

It is an amenable number.

221311052 is a deficient number, since it is larger than the sum of its proper divisors (166414804).

221311052 is a wasteful number, since it uses less digits than its factorization.

221311052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61648 (or 61646 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 221311052 is about 14876.5268796181. The cubic root of 221311052 is about 604.8778771331.

Adding to 221311052 its reverse (250113122), we get a palindrome (471424174).

The spelling of 221311052 in words is "two hundred twenty-one million, three hundred eleven thousand, fifty-two".