20001000121012 has 24 divisors (see below), whose sum is σ = 35179865809704. Its totient is φ = 9949611165312.

The previous prime is 20001000120949. The next prime is 20001000121019. The reversal of 20001000121012 is 21012100010002.

It can be written as a sum of positive squares in 4 ways, for example, as 17988761411856 + 2012238709156 = 4241316^2 + 1418534^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 20001000121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001000121019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122686578 + ... + 122849494.

It is an arithmetic number, because the mean of its divisors is an integer number (1465827742071).

Almost surely, 2^{20001000121012} is an apocalyptic number.

It is an amenable number.

20001000121012 is a deficient number, since it is larger than the sum of its proper divisors (15178865688692).

20001000121012 is a wasteful number, since it uses less digits than its factorization.

20001000121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318915 (or 318913 counting only the distinct ones).

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

Adding to 20001000121012 its reverse (21012100010002), we get a palindrome (41013100131014).

The spelling of 20001000121012 in words is "twenty trillion, one billion, one hundred twenty-one thousand, twelve".