21462227009 has 2 divisors, whose sum is σ = 21462227010. Its totient is φ = 21462227008.

The previous prime is 21462226999. The next prime is 21462227011. The reversal of 21462227009 is 90072226412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16153647409 + 5308579600 = 127097^2 + 72860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21462227009 is a prime.

It is a Sophie Germain prime.

Together with 21462227011, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21462227009.

It is not a weakly prime, because it can be changed into another prime (21462227509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10731113504 + 10731113505.

It is an arithmetic number, because the mean of its divisors is an integer number (10731113505).

Almost surely, 2^21462227009 is an apocalyptic number.

It is an amenable number.

21462227009 is a deficient number, since it is larger than the sum of its proper divisors (1).

21462227009 is an equidigital number, since it uses as much as digits as its factorization.

21462227009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 21462227009 in words is "twenty-one billion, four hundred sixty-two million, two hundred twenty-seven thousand, nine".