221021102 has 4 divisors (see below), whose sum is σ = 331531656. Its totient is φ = 110510550.

The previous prime is 221021089. The next prime is 221021111. The reversal of 221021102 is 201120122.

It is a happy number.

221021102 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55255274 + ... + 55255277.

It is an arithmetic number, because the mean of its divisors is an integer number (82882914).

Almost surely, 2^221021102 is an apocalyptic number.

221021102 is a deficient number, since it is larger than the sum of its proper divisors (110510554).

221021102 is a wasteful number, since it uses less digits than its factorization.

221021102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110510553.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221021102 is about 14866.7784674421. The cubic root of 221021102 is about 604.6136020509.

Adding to 221021102 its reverse (201120122), we get a palindrome (422141224).

The spelling of 221021102 in words is "two hundred twenty-one million, twenty-one thousand, one hundred two".