21318606341 has 2 divisors, whose sum is σ = 21318606342. Its totient is φ = 21318606340.

The previous prime is 21318606311. The next prime is 21318606371. The reversal of 21318606341 is 14360681312.

It is a balanced prime because it is at equal distance from previous prime (21318606311) and next prime (21318606371).

It can be written as a sum of positive squares in only one way, i.e., 16556226241 + 4762380100 = 128671^2 + 69010^2 .

It is a cyclic number.

It is not a de Polignac number, because 21318606341 - 2¹⁸ = 21318344197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21318606311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10659303170 + 10659303171.

It is an arithmetic number, because the mean of its divisors is an integer number (10659303171).

Almost surely, 2^21318606341 is an apocalyptic number.

It is an amenable number.

21318606341 is a deficient number, since it is larger than the sum of its proper divisors (1).

21318606341 is an equidigital number, since it uses as much as digits as its factorization.

21318606341 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21318606341 in words is "twenty-one billion, three hundred eighteen million, six hundred six thousand, three hundred forty-one".