20002001211001 has 2 divisors, whose sum is σ = 20002001211002. Its totient is φ = 20002001211000.

The previous prime is 20002001210977. The next prime is 20002001211011. The reversal of 20002001211001 is 10011210020002.

It is an a-pointer prime, because the next prime (20002001211011) can be obtained adding 20002001211001 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18513786645225 + 1488214565776 = 4302765^2 + 1219924^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002001211001 - 2²¹ = 20001999113849 is a prime.

It is not a weakly prime, because it can be changed into another prime (20002001211011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001000605500 + 10001000605501.

It is an arithmetic number, because the mean of its divisors is an integer number (10001000605501).

Almost surely, 2^{20002001211001} is an apocalyptic number.

It is an amenable number.

20002001211001 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002001211001 is an equidigital number, since it uses as much as digits as its factorization.

20002001211001 is an evil number, because the sum of its binary digits is even.

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

Adding to 20002001211001 its reverse (10011210020002), we get a palindrome (30013211231003).

The spelling of 20002001211001 in words is "twenty trillion, two billion, one million, two hundred eleven thousand, one".