20021021221222 has 16 divisors (see below), whose sum is σ = 34336758044160. Its totient is φ = 8576685821448.

The previous prime is 20021021221211. The next prime is 20021021221297. The reversal of 20021021221222 is 22212212012002.

It is a self number, because there is not a number n which added to its sum of digits gives 20021021221222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 312620572 + ... + 312684607.

It is an arithmetic number, because the mean of its divisors is an integer number (2146047377760).

Almost surely, 2^{20021021221222} is an apocalyptic number.

20021021221222 is a deficient number, since it is larger than the sum of its proper divisors (14315736822938).

20021021221222 is a wasteful number, since it uses less digits than its factorization.

20021021221222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625307475.

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

Adding to 20021021221222 its reverse (22212212012002), we get a palindrome (42233233233224).

The spelling of 20021021221222 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-two".