2121090787 has 2 divisors, whose sum is σ = 2121090788. Its totient is φ = 2121090786.

The previous prime is 2121090767. The next prime is 2121090791. The reversal of 2121090787 is 7870901212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2121090787 - 2¹⁹ = 2120566499 is a prime.

It is a super-2 number, since 2×2121090787² = 8998052253392558738, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2121090737) 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, 1060545393 + 1060545394.

It is an arithmetic number, because the mean of its divisors is an integer number (1060545394).

Almost surely, 2^2121090787 is an apocalyptic number.

2121090787 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121090787 is an equidigital number, since it uses as much as digits as its factorization.

2121090787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 2121090787 is about 46055.3013995132. The cubic root of 2121090787 is about 1284.8519437588.

Adding to 2121090787 its reverse (7870901212), we get a palindrome (9991991999).

The spelling of 2121090787 in words is "two billion, one hundred twenty-one million, ninety thousand, seven hundred eighty-seven".