20001212012120 has 192 divisors, whose sum is σ = 46523498847840. Its totient is φ = 7734245990400.

The previous prime is 20001212012113. The next prime is 20001212012149. The reversal of 20001212012120 is 2121021210002.

It is a junction number, because it is equal to n+sod(n) for n = 20001212012095 and 20001212012104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 24662406515 + ... + 24662407325.

Almost surely, 2^{20001212012120} is an apocalyptic number.

20001212012120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20001212012120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23261749423920).

20001212012120 is an abundant number, since it is smaller than the sum of its proper divisors (26522286835720).

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

20001212012120 is a wasteful number, since it uses less digits than its factorization.

20001212012120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606 (or 1369 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20001212012120 its reverse (2121021210002), we get a palindrome (22122233222122).

The spelling of 20001212012120 in words is "twenty trillion, one billion, two hundred twelve million, twelve thousand, one hundred twenty".