2120891 has 2 divisors, whose sum is σ = 2120892. Its totient is φ = 2120890.

The previous prime is 2120887. The next prime is 2120917. The reversal of 2120891 is 1980212.

2120891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2120891 - 2² = 2120887 is a prime.

It is a super-4 number, since 4×2120891⁴ (a number of 26 digits) contains 4444 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2120851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060445 + 1060446.

It is an arithmetic number, because the mean of its divisors is an integer number (1060446).

2^2120891 is an apocalyptic number.

2120891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120891 is an equidigital number, since it uses as much as digits as its factorization.

2120891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2120891 is about 1456.3279163705. The cubic root of 2120891 is about 128.4811602129.

The spelling of 2120891 in words is "two million, one hundred twenty thousand, eight hundred ninety-one".