20012201200991 has 2 divisors, whose sum is σ = 20012201200992. Its totient is φ = 20012201200990.

The previous prime is 20012201200987. The next prime is 20012201201009. The reversal of 20012201200991 is 19900210221002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20012201200991 - 2² = 20012201200987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012201200291) 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, 10006100600495 + 10006100600496.

It is an arithmetic number, because the mean of its divisors is an integer number (10006100600496).

Almost surely, 2^{20012201200991} is an apocalyptic number.

20012201200991 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012201200991 is an equidigital number, since it uses as much as digits as its factorization.

20012201200991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 29.

Adding to 20012201200991 its reverse (19900210221002), we get a palindrome (39912411421993).

The spelling of 20012201200991 in words is "twenty trillion, twelve billion, two hundred one million, two hundred thousand, nine hundred ninety-one".