2120211301991 has 2 divisors, whose sum is σ = 2120211301992. Its totient is φ = 2120211301990.

The previous prime is 2120211301981. The next prime is 2120211302059. The reversal of 2120211301991 is 1991031120212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2120211301991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2120211301931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060105650995 + 1060105650996.

It is an arithmetic number, because the mean of its divisors is an integer number (1060105650996).

Almost surely, 2^{2120211301991} is an apocalyptic number.

2120211301991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120211301991 is an equidigital number, since it uses as much as digits as its factorization.

2120211301991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 2120211301991 in words is "two trillion, one hundred twenty billion, two hundred eleven million, three hundred one thousand, nine hundred ninety-one".