20021220120012 has 48 divisors (see below), whose sum is σ = 46823853763680. Its totient is φ = 6658367021568.

The previous prime is 20021220120001. The next prime is 20021220120029. The reversal of 20021220120012 is 21002102212002.

It is a junction number, because it is equal to n+sod(n) for n = 20021220119973 and 20021220120000.

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 15 ways as a sum of consecutive naturals, for example, 17481918 + ... + 18591930.

It is an arithmetic number, because the mean of its divisors is an integer number (975496953410).

Almost surely, 2^{20021220120012} is an apocalyptic number.

It is an amenable number.

20021220120012 is an abundant number, since it is smaller than the sum of its proper divisors (26802633643668).

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

20021220120012 is a wasteful number, since it uses less digits than its factorization.

20021220120012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1113482 (or 1113480 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021220120012 its reverse (21002102212002), we get a palindrome (41023322332014).

The spelling of 20021220120012 in words is "twenty trillion, twenty-one billion, two hundred twenty million, one hundred twenty thousand, twelve".