21214036536661 has 16 divisors (see below), whose sum is σ = 21544081920000. Its totient is φ = 20885538104496.

The previous prime is 21214036536617. The next prime is 21214036536677. The reversal of 21214036536661 is 16663563041212.

It is a cyclic number.

It is not a de Polignac number, because 21214036536661 - 2¹⁹ = 21214036012373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 546185080 + ... + 546223918.

It is an arithmetic number, because the mean of its divisors is an integer number (1346505120000).

Almost surely, 2^{21214036536661} is an apocalyptic number.

It is an amenable number.

21214036536661 is a deficient number, since it is larger than the sum of its proper divisors (330045383339).

21214036536661 is a wasteful number, since it uses less digits than its factorization.

21214036536661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58536.

The product of its (nonzero) digits is 933120, while the sum is 46.

Adding to 21214036536661 its reverse (16663563041212), we get a palindrome (37877599577873).

The spelling of 21214036536661 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, six hundred sixty-one".