2121090487 has 2 divisors, whose sum is σ = 2121090488. Its totient is φ = 2121090486.

The previous prime is 2121090467. The next prime is 2121090523. The reversal of 2121090487 is 7840901212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2121090487 - 2⁷ = 2121090359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121090407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060545243 + 1060545244.

It is an arithmetic number, because the mean of its divisors is an integer number (1060545244).

Almost surely, 2^2121090487 is an apocalyptic number.

2121090487 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121090487 is an equidigital number, since it uses as much as digits as its factorization.

2121090487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 2121090487 is about 46055.2981425590. The cubic root of 2121090487 is about 1284.8518831837.

Adding to 2121090487 its reverse (7840901212), we get a palindrome (9961991699).

The spelling of 2121090487 in words is "two billion, one hundred twenty-one million, ninety thousand, four hundred eighty-seven".