2191934149121 has 2 divisors, whose sum is σ = 2191934149122. Its totient is φ = 2191934149120.

The previous prime is 2191934149109. The next prime is 2191934149159. The reversal of 2191934149121 is 1219414391912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1324027640896 + 867906508225 = 1150664^2 + 931615^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191934149121 - 2⁶ = 2191934149057 is a prime.

It is not a weakly prime, because it can be changed into another prime (2191934149721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095967074560 + 1095967074561.

It is an arithmetic number, because the mean of its divisors is an integer number (1095967074561).

Almost surely, 2^{2191934149121} is an apocalyptic number.

It is an amenable number.

2191934149121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191934149121 is an equidigital number, since it uses as much as digits as its factorization.

2191934149121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 47.

The spelling of 2191934149121 in words is "two trillion, one hundred ninety-one billion, nine hundred thirty-four million, one hundred forty-nine thousand, one hundred twenty-one".