221211102 has 128 divisors (see below), whose sum is σ = 557383680. Its totient is φ = 57150720.

The previous prime is 221211083. The next prime is 221211127. The reversal of 221211102 is 201112122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2485474 + ... + 2485562.

It is an arithmetic number, because the mean of its divisors is an integer number (4354560).

Almost surely, 2^221211102 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221211102, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278691840).

221211102 is an abundant number, since it is smaller than the sum of its proper divisors (336172578).

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

221211102 is a wasteful number, since it uses less digits than its factorization.

221211102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 221211102 is about 14873.1671812025. The cubic root of 221211102 is about 604.7868037367.

Adding to 221211102 its reverse (201112122), we get a palindrome (422323224).

It can be divided in two parts, 22121 and 1102, that multiplied together give a palindrome (24377342).

The spelling of 221211102 in words is "two hundred twenty-one million, two hundred eleven thousand, one hundred two".