21221120011222 has 4 divisors (see below), whose sum is σ = 31831680016836. Its totient is φ = 10610560005610.

The previous prime is 21221120011187. The next prime is 21221120011349. The reversal of 21221120011222 is 22211002112212.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21221120011222.

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, 5305280002804 + ... + 5305280002807.

It is an arithmetic number, because the mean of its divisors is an integer number (7957920004209).

Almost surely, 2^{21221120011222} is an apocalyptic number.

21221120011222 is a deficient number, since it is larger than the sum of its proper divisors (10610560005614).

21221120011222 is a wasteful number, since it uses less digits than its factorization.

21221120011222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10610560005613.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21221120011222 its reverse (22211002112212), we get a palindrome (43432122123434).

The spelling of 21221120011222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty million, eleven thousand, two hundred twenty-two".