2121222300991 has 2 divisors, whose sum is σ = 2121222300992. Its totient is φ = 2121222300990.

The previous prime is 2121222300971. The next prime is 2121222301043. The reversal of 2121222300991 is 1990032221212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121222300991 - 2⁷ = 2121222300863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121222300971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060611150495 + 1060611150496.

It is an arithmetic number, because the mean of its divisors is an integer number (1060611150496).

Almost surely, 2^{2121222300991} is an apocalyptic number.

2121222300991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121222300991 is an equidigital number, since it uses as much as digits as its factorization.

2121222300991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The spelling of 2121222300991 in words is "two trillion, one hundred twenty-one billion, two hundred twenty-two million, three hundred thousand, nine hundred ninety-one".