21221022001222 has 4 divisors (see below), whose sum is σ = 31831533001836. Its totient is φ = 10610511000610.

The previous prime is 21221022001187. The next prime is 21221022001243. The reversal of 21221022001222 is 22210022012212.

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 21221022001222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5305255500304 + ... + 5305255500307.

It is an arithmetic number, because the mean of its divisors is an integer number (7957883250459).

Almost surely, 2^{21221022001222} is an apocalyptic number.

21221022001222 is a deficient number, since it is larger than the sum of its proper divisors (10610511000614).

21221022001222 is a wasteful number, since it uses less digits than its factorization.

21221022001222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10610511000613.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21221022001222 its reverse (22210022012212), we get a palindrome (43431044013434).

The spelling of 21221022001222 in words is "twenty-one trillion, two hundred twenty-one billion, twenty-two million, one thousand, two hundred twenty-two".