21113010409 has 2 divisors, whose sum is σ = 21113010410. Its totient is φ = 21113010408.

The previous prime is 21113010403. The next prime is 21113010421. The reversal of 21113010409 is 90401031112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18364315225 + 2748695184 = 135515^2 + 52428^2 .

It is a cyclic number.

It is not a de Polignac number, because 21113010409 - 2²³ = 21104621801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21113010409.

It is not a weakly prime, because it can be changed into another prime (21113010403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556505204 + 10556505205.

It is an arithmetic number, because the mean of its divisors is an integer number (10556505205).

Almost surely, 2^21113010409 is an apocalyptic number.

It is an amenable number.

21113010409 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113010409 is an equidigital number, since it uses as much as digits as its factorization.

21113010409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 21113010409 in words is "twenty-one billion, one hundred thirteen million, ten thousand, four hundred nine".