2001101220997 has 2 divisors, whose sum is σ = 2001101220998. Its totient is φ = 2001101220996.

The previous prime is 2001101220949. The next prime is 2001101221051. The reversal of 2001101220997 is 7990221011002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1162495832481 + 838605388516 = 1078191^2 + 915754^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001101220997 - 2⁷ = 2001101220869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001101221997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000550610498 + 1000550610499.

It is an arithmetic number, because the mean of its divisors is an integer number (1000550610499).

Almost surely, 2^{2001101220997} is an apocalyptic number.

It is an amenable number.

2001101220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001101220997 is an equidigital number, since it uses as much as digits as its factorization.

2001101220997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 34.

Adding to 2001101220997 its reverse (7990221011002), we get a palindrome (9991322231999).

The spelling of 2001101220997 in words is "two trillion, one billion, one hundred one million, two hundred twenty thousand, nine hundred ninety-seven".