221021052 has 24 divisors (see below), whose sum is σ = 589389696. Its totient is φ = 63148848.

The previous prime is 221021033. The next prime is 221021057. The reversal of 221021052 is 250120122.

221021052 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1315518 + ... + 1315685.

It is an arithmetic number, because the mean of its divisors is an integer number (24557904).

Almost surely, 2^221021052 is an apocalyptic number.

It is an amenable number.

221021052 is an abundant number, since it is smaller than the sum of its proper divisors (368368644).

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

221021052 is a wasteful number, since it uses less digits than its factorization.

221021052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2631217 (or 2631215 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 221021052 is about 14866.7767858403. The cubic root of 221021052 is about 604.6135564585.

Adding to 221021052 its reverse (250120122), we get a palindrome (471141174).

The spelling of 221021052 in words is "two hundred twenty-one million, twenty-one thousand, fifty-two".