21141302009 has 2 divisors, whose sum is σ = 21141302010. Its totient is φ = 21141302008.

The previous prime is 21141301967. The next prime is 21141302011. The reversal of 21141302009 is 90020314112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20298270784 + 843031225 = 142472^2 + 29035^2 .

It is a cyclic number.

It is not a de Polignac number, because 21141302009 - 2²⁴ = 21124524793 is a prime.

It is a Sophie Germain prime.

Together with 21141302011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (21141302029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570651004 + 10570651005.

It is an arithmetic number, because the mean of its divisors is an integer number (10570651005).

Almost surely, 2^21141302009 is an apocalyptic number.

It is an amenable number.

21141302009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141302009 is an equidigital number, since it uses as much as digits as its factorization.

21141302009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

The spelling of 21141302009 in words is "twenty-one billion, one hundred forty-one million, three hundred two thousand, nine".