221121211210 has 16 divisors (see below), whose sum is σ = 398182490496. Its totient is φ = 88411971088.

The previous prime is 221121211183. The next prime is 221121211219. The reversal of 221121211210 is 12112121122.

It is not an unprimeable number, because it can be changed into a prime (221121211219) 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, 4538734 + ... + 4587193.

It is an arithmetic number, because the mean of its divisors is an integer number (24886405656).

Almost surely, 2^221121211210 is an apocalyptic number.

221121211210 is a deficient number, since it is larger than the sum of its proper divisors (177061279286).

221121211210 is a wasteful number, since it uses less digits than its factorization.

221121211210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9128357.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221121211210 its reverse (12112121122), we get a palindrome (233233332332).

The spelling of 221121211210 in words is "two hundred twenty-one billion, one hundred twenty-one million, two hundred eleven thousand, two hundred ten".