20001210120000 has 700 divisors, whose sum is σ = 74265683823936. Its totient is φ = 5320909440000.

The previous prime is 20001210119999. The next prime is 20001210120077. The reversal of 20001210120000 is 2101210002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 1396432839 + ... + 1396447161.

Almost surely, 2^{20001210120000} is an apocalyptic number.

20001210120000 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 20001210120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37132841911968).

20001210120000 is an abundant number, since it is smaller than the sum of its proper divisors (54264473703936).

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

20001210120000 is an equidigital number, since it uses as much as digits as its factorization.

20001210120000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14798 (or 14764 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20001210120000 its reverse (2101210002), we get a palindrome (20003311330002).

The spelling of 20001210120000 in words is "twenty trillion, one billion, two hundred ten million, one hundred twenty thousand".