2120135491 has 2 divisors, whose sum is σ = 2120135492. Its totient is φ = 2120135490.

The previous prime is 2120135389. The next prime is 2120135497. The reversal of 2120135491 is 1945310212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2120135491 - 2⁷ = 2120135363 is a prime.

It is a super-2 number, since 2×2120135491² = 8989949000395622162, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2120135497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060067745 + 1060067746.

It is an arithmetic number, because the mean of its divisors is an integer number (1060067746).

Almost surely, 2^2120135491 is an apocalyptic number.

2120135491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120135491 is an equidigital number, since it uses as much as digits as its factorization.

2120135491 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2120135491 is about 46044.9290476161. The cubic root of 2120135491 is about 1284.6590244295.

The spelling of 2120135491 in words is "two billion, one hundred twenty million, one hundred thirty-five thousand, four hundred ninety-one".