221221052 has 12 divisors (see below), whose sum is σ = 416916696. Its totient is φ = 102102000.

The previous prime is 221221037. The next prime is 221221067. The reversal of 221221052 is 250122122.

It is an interprime number because it is at equal distance from previous prime (221221037) and next prime (221221067).

It is a self number, because there is not a number n which added to its sum of digits gives 221221052.

It is a congruent 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, 2127074 + ... + 2127177.

It is an arithmetic number, because the mean of its divisors is an integer number (34743058).

Almost surely, 2^221221052 is an apocalyptic number.

It is an amenable number.

221221052 is a deficient number, since it is larger than the sum of its proper divisors (195695644).

221221052 is a wasteful number, since it uses less digits than its factorization.

221221052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4254268 (or 4254266 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 221221052 is about 14873.5016724375. The cubic root of 221221052 is about 604.7958713022.

Adding to 221221052 its reverse (250122122), we get a palindrome (471343174).

The spelling of 221221052 in words is "two hundred twenty-one million, two hundred twenty-one thousand, fifty-two".