2121332009 has 2 divisors, whose sum is σ = 2121332010. Its totient is φ = 2121332008.

The previous prime is 2121331997. The next prime is 2121332027. The reversal of 2121332009 is 9002331212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1923085609 + 198246400 = 43853^2 + 14080^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121332009 - 2⁸ = 2121331753 is a prime.

It is not a weakly prime, because it can be changed into another prime (2121332099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060666004 + 1060666005.

It is an arithmetic number, because the mean of its divisors is an integer number (1060666005).

Almost surely, 2^2121332009 is an apocalyptic number.

It is an amenable number.

2121332009 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121332009 is an equidigital number, since it uses as much as digits as its factorization.

2121332009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 2121332009 is about 46057.9201549527. The cubic root of 2121332009 is about 1284.9006487001.

The spelling of 2121332009 in words is "two billion, one hundred twenty-one million, three hundred thirty-two thousand, nine".