21214036535605 has 4 divisors (see below), whose sum is σ = 25456843842732. Its totient is φ = 16971229228480.

The previous prime is 21214036535591. The next prime is 21214036535663. The reversal of 21214036535605 is 50653563041212.

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 10701442945636 + 10512593589969 = 3271306^2 + 3242313^2 .

It is not a de Polignac number, because 21214036535605 - 2⁹ = 21214036535093 is a prime.

It is a super-2 number, since 2×21214036535605² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2121403653556 + ... + 2121403653565.

It is an arithmetic number, because the mean of its divisors is an integer number (6364210960683).

Almost surely, 2^{21214036535605} is an apocalyptic number.

It is an amenable number.

21214036535605 is a deficient number, since it is larger than the sum of its proper divisors (4242807307127).

21214036535605 is an equidigital number, since it uses as much as digits as its factorization.

21214036535605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4242807307126.

The product of its (nonzero) digits is 648000, while the sum is 43.

Adding to 21214036535605 its reverse (50653563041212), we get a palindrome (71867599576817).

The spelling of 21214036535605 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-five thousand, six hundred five".