20221220012021 has 12 divisors (see below), whose sum is σ = 23966467156332. Its totient is φ = 17005446476928.

The previous prime is 20221220011969. The next prime is 20221220012047. The reversal of 20221220012021 is 12021002212202.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13107397531396 + 7113822480625 = 3620414^2 + 2667175^2 .

It is not a de Polignac number, because 20221220012021 - 2¹⁸ = 20221219749877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20221220012051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3893185700 + ... + 3893190893.

It is an arithmetic number, because the mean of its divisors is an integer number (1997205596361).

Almost surely, 2^{20221220012021} is an apocalyptic number.

It is an amenable number.

20221220012021 is a deficient number, since it is larger than the sum of its proper divisors (3745247144311).

20221220012021 is an equidigital number, since it uses as much as digits as its factorization.

20221220012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7786376660 (or 7786376653 counting only the distinct ones).

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

Adding to 20221220012021 its reverse (12021002212202), we get a palindrome (32242222224223).

The spelling of 20221220012021 in words is "twenty trillion, two hundred twenty-one billion, two hundred twenty million, twelve thousand, twenty-one".