21220211111102 has 4 divisors (see below), whose sum is σ = 31830316666656. Its totient is φ = 10610105555550.

The previous prime is 21220211111093. The next prime is 21220211111119. The reversal of 21220211111102 is 20111111202212.

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, 5305052777774 + ... + 5305052777777.

It is an arithmetic number, because the mean of its divisors is an integer number (7957579166664).

Almost surely, 2^{21220211111102} is an apocalyptic number.

21220211111102 is a deficient number, since it is larger than the sum of its proper divisors (10610105555554).

21220211111102 is a wasteful number, since it uses less digits than its factorization.

21220211111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610105555553.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21220211111102 its reverse (20111111202212), we get a palindrome (41331322313314).

The spelling of 21220211111102 in words is "twenty-one trillion, two hundred twenty billion, two hundred eleven million, one hundred eleven thousand, one hundred two".