21213611540041 has 4 divisors (see below), whose sum is σ = 21216678427332. Its totient is φ = 21210544652752.

The previous prime is 21213611540039. The next prime is 21213611540047. The reversal of 21213611540041 is 14004511631212.

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 10096055050041 + 11117556490000 = 3177429^2 + 3334300^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213611540041 - 2¹ = 21213611540039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21213611539985 and 21213611540012.

It is not an unprimeable number, because it can be changed into a prime (21213611540047) 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, 1533433270 + ... + 1533447103.

It is an arithmetic number, because the mean of its divisors is an integer number (5304169606833).

Almost surely, 2^{21213611540041} is an apocalyptic number.

It is an amenable number.

21213611540041 is a deficient number, since it is larger than the sum of its proper divisors (3066887291).

21213611540041 is an equidigital number, since it uses as much as digits as its factorization.

21213611540041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3066887290.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 21213611540041 in words is "twenty-one trillion, two hundred thirteen billion, six hundred eleven million, five hundred forty thousand, forty-one".