20021220121012 has 96 divisors (see below), whose sum is σ = 38738916486144. Its totient is φ = 8978391206400.

The previous prime is 20021220121003. The next prime is 20021220121043. The reversal of 20021220121012 is 21012102212002.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 1064779203 + ... + 1064798005.

It is an arithmetic number, because the mean of its divisors is an integer number (403530380064).

Almost surely, 2^{20021220121012} is an apocalyptic number.

20021220121012 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

20021220121012 is a deficient number, since it is larger than the sum of its proper divisors (18717696365132).

20021220121012 is a wasteful number, since it uses less digits than its factorization.

20021220121012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19909 (or 19907 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20021220121012 its reverse (21012102212002), we get a palindrome (41033322333014).

The spelling of 20021220121012 in words is "twenty trillion, twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, twelve".