21335318941 has 4 divisors (see below), whose sum is σ = 21395759292. Its totient is φ = 21274878592.

The previous prime is 21335318887. The next prime is 21335318951. The reversal of 21335318941 is 14981353312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7121672100 + 14213646841 = 84390^2 + 119221^2 .

It is a cyclic number.

It is not a de Polignac number, because 21335318941 - 2⁹ = 21335318429 is a prime.

It is a super-2 number, since 2×21335318941² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21335318894 and 21335318903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21335318951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30219646 + ... + 30220351.

It is an arithmetic number, because the mean of its divisors is an integer number (5348939823).

Almost surely, 2^21335318941 is an apocalyptic number.

It is an amenable number.

21335318941 is a deficient number, since it is larger than the sum of its proper divisors (60440351).

21335318941 is an equidigital number, since it uses as much as digits as its factorization.

21335318941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60440350.

The product of its digits is 77760, while the sum is 40.

The spelling of 21335318941 in words is "twenty-one billion, three hundred thirty-five million, three hundred eighteen thousand, nine hundred forty-one".