221121111102 has 32 divisors (see below), whose sum is σ = 456004370304. Its totient is φ = 71429220000.

The previous prime is 221121111059. The next prime is 221121111109. The reversal of 221121111102 is 201111121122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221121111109) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1928424 + ... + 2039867.

It is an arithmetic number, because the mean of its divisors is an integer number (14250136572).

Almost surely, 2^221121111102 is an apocalyptic number.

221121111102 is an abundant number, since it is smaller than the sum of its proper divisors (234883259202).

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

221121111102 is a wasteful number, since it uses less digits than its factorization.

221121111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3968584.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 221121111102 its reverse (201111121122), we get a palindrome (422232232224).

The spelling of 221121111102 in words is "two hundred twenty-one billion, one hundred twenty-one million, one hundred eleven thousand, one hundred two".