21001641413 has 2 divisors, whose sum is σ = 21001641414. Its totient is φ = 21001641412.

The previous prime is 21001641403. The next prime is 21001641421. The reversal of 21001641413 is 31414610012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20220271204 + 781370209 = 142198^2 + 27953^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001641413 - 2¹⁰ = 21001640389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001641403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500820706 + 10500820707.

It is an arithmetic number, because the mean of its divisors is an integer number (10500820707).

Almost surely, 2^21001641413 is an apocalyptic number.

It is an amenable number.

21001641413 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001641413 is an equidigital number, since it uses as much as digits as its factorization.

21001641413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 23.

The spelling of 21001641413 in words is "twenty-one billion, one million, six hundred forty-one thousand, four hundred thirteen".