20121011002000 has 80 divisors (see below), whose sum is σ = 48738112815600. Its totient is φ = 8034259123200.

The previous prime is 20121011001979. The next prime is 20121011002009. The reversal of 20121011002000 is 20011012102.

It can be written as a sum of positive squares in 8 ways, for example, as 8700423323904 + 11420587678096 = 2949648^2 + 3379436^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (20121011002009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7702515 + ... + 9978514.

It is an arithmetic number, because the mean of its divisors is an integer number (609226410195).

Almost surely, 2^{20121011002000} is an apocalyptic number.

20121011002000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20121011002000 is an abundant number, since it is smaller than the sum of its proper divisors (28617101813600).

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

20121011002000 is a wasteful number, since it uses less digits than its factorization.

20121011002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17681621 (or 17681605 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20121011002000 its reverse (20011012102), we get a palindrome (20141022014102).

The spelling of 20121011002000 in words is "twenty trillion, one hundred twenty-one billion, eleven million, two thousand".