20121221022020 has 12 divisors (see below), whose sum is σ = 42254564146284. Its totient is φ = 8048488408800.

The previous prime is 20121221022017. The next prime is 20121221022059. The reversal of 20121221022020 is 2022012212102.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2422573957444 + 17698647064576 = 1556462^2 + 4206976^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20121221022020.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 503030525531 + ... + 503030525570.

It is an arithmetic number, because the mean of its divisors is an integer number (3521213678857).

Almost surely, 2^{20121221022020} is an apocalyptic number.

20121221022020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121221022020 is an abundant number, since it is smaller than the sum of its proper divisors (22133343124264).

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

20121221022020 is a wasteful number, since it uses less digits than its factorization.

20121221022020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006061051110 (or 1006061051108 counting only the distinct ones).

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

Adding to 20121221022020 its reverse (2022012212102), we get a palindrome (22143233234122).

The spelling of 20121221022020 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, twenty".