221221102 has 16 divisors (see below), whose sum is σ = 351727920. Its totient is φ = 103992448.

The previous prime is 221221097. The next prime is 221221127. The reversal of 221221102 is 201122122.

It is a happy number.

221221102 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34773 + ... + 40639.

It is an arithmetic number, because the mean of its divisors is an integer number (21982995).

Almost surely, 2^221221102 is an apocalyptic number.

221221102 is a deficient number, since it is larger than the sum of its proper divisors (130506818).

221221102 is a wasteful number, since it uses less digits than its factorization.

221221102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6995.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221221102 is about 14873.5033532789. The cubic root of 221221102 is about 604.7959168671.

Adding to 221221102 its reverse (201122122), we get a palindrome (422343224).

The spelling of 221221102 in words is "two hundred twenty-one million, two hundred twenty-one thousand, one hundred two".