20212221021020 has 24 divisors (see below), whose sum is σ = 48509330450784. Its totient is φ = 6929904350016.

The previous prime is 20212221021017. The next prime is 20212221021023. The reversal of 20212221021020 is 2012012221202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20212221021017) and next prime (20212221021023).

It is a self number, because there is not a number n which added to its sum of digits gives 20212221021020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212221021023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72186503507 + ... + 72186503786.

It is an arithmetic number, because the mean of its divisors is an integer number (2021222102116).

Almost surely, 2^{20212221021020} is an apocalyptic number.

20212221021020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20212221021020 is an abundant number, since it is smaller than the sum of its proper divisors (28297109429764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20212221021020 is a wasteful number, since it uses less digits than its factorization.

20212221021020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144373007309 (or 144373007307 counting only the distinct ones).

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

Adding to 20212221021020 its reverse (2012012221202), we get a palindrome (22224233242222).

The spelling of 20212221021020 in words is "twenty trillion, two hundred twelve billion, two hundred twenty-one million, twenty-one thousand, twenty".