221222052 has 18 divisors (see below), whose sum is σ = 559200278. Its totient is φ = 73740672.

The previous prime is 221222039. The next prime is 221222069. The reversal of 221222052 is 250222122.

221222052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 215913636 + 5308416 = 14694^2 + 2304^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3072493 + ... + 3072564.

Almost surely, 2^221222052 is an apocalyptic number.

It is an amenable number.

221222052 is an abundant number, since it is smaller than the sum of its proper divisors (337978226).

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

221222052 is a wasteful number, since it uses less digits than its factorization.

221222052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6145067 (or 6145062 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 221222052 is about 14873.5352892310. The cubic root of 221222052 is about 604.7967826003.

Adding to 221222052 its reverse (250222122), we get a palindrome (471444174).

The spelling of 221222052 in words is "two hundred twenty-one million, two hundred twenty-two thousand, fifty-two".