21214036536613 has 4 divisors (see below), whose sum is σ = 21250176292800. Its totient is φ = 21177896780428.

The previous prime is 21214036536607. The next prime is 21214036536617. The reversal of 21214036536613 is 31663563041212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214036536613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21214036536613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214036536617) 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, 18069877213 + ... + 18069878386.

It is an arithmetic number, because the mean of its divisors is an integer number (5312544073200).

Almost surely, 2^{21214036536613} is an apocalyptic number.

It is an amenable number.

21214036536613 is a deficient number, since it is larger than the sum of its proper divisors (36139756187).

21214036536613 is an equidigital number, since it uses as much as digits as its factorization.

21214036536613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36139756186.

The product of its (nonzero) digits is 466560, while the sum is 43.

Adding to 21214036536613 its reverse (31663563041212), we get a palindrome (52877599577825).

The spelling of 21214036536613 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, six hundred thirteen".