20001201001121 has 2 divisors, whose sum is σ = 20001201001122. Its totient is φ = 20001201001120.

The previous prime is 20001201001109. The next prime is 20001201001139. The reversal of 20001201001121 is 12110010210002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16743121850896 + 3258079150225 = 4091836^2 + 1805015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001201001121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001201001421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000600500560 + 10000600500561.

It is an arithmetic number, because the mean of its divisors is an integer number (10000600500561).

Almost surely, 2^{20001201001121} is an apocalyptic number.

It is an amenable number.

20001201001121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001201001121 is an equidigital number, since it uses as much as digits as its factorization.

20001201001121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20001201001121 its reverse (12110010210002), we get a palindrome (32111211211123).

The spelling of 20001201001121 in words is "twenty trillion, one billion, two hundred one million, one thousand, one hundred twenty-one".