21221000120222 has 32 divisors (see below), whose sum is σ = 36788293920960. Its totient is φ = 8992359002880.

The previous prime is 21221000120213. The next prime is 21221000120297. The reversal of 21221000120222 is 22202100012212.

It is a happy number.

It is a super-2 number, since 2×21221000120222² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21221000120222.

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 in 15 ways as a sum of consecutive naturals, for example, 85148072 + ... + 85396932.

It is an arithmetic number, because the mean of its divisors is an integer number (1149634185030).

Almost surely, 2^{21221000120222} is an apocalyptic number.

21221000120222 is a deficient number, since it is larger than the sum of its proper divisors (15567293800738).

21221000120222 is a wasteful number, since it uses less digits than its factorization.

21221000120222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317396.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21221000120222 its reverse (22202100012212), we get a palindrome (43423100132434).

The spelling of 21221000120222 in words is "twenty-one trillion, two hundred twenty-one billion, one hundred twenty thousand, two hundred twenty-two".