21214036536537 has 16 divisors (see below), whose sum is σ = 30461288428928. Its totient is φ = 13054745531520.

The previous prime is 21214036536493. The next prime is 21214036536551. The reversal of 21214036536537 is 73563563041212.

It is not a de Polignac number, because 21214036536537 - 2²⁰ = 21214035487961 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214036536557) 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, 12636237 + ... + 14216277.

It is an arithmetic number, because the mean of its divisors is an integer number (1903830526808).

Almost surely, 2^{21214036536537} is an apocalyptic number.

It is an amenable number.

21214036536537 is a deficient number, since it is larger than the sum of its proper divisors (9247251892391).

21214036536537 is a wasteful number, since it uses less digits than its factorization.

21214036536537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924320.

The product of its (nonzero) digits is 2721600, while the sum is 48.

Adding to 21214036536537 its reverse (73563563041212), we get a palindrome (94777599577749).

The spelling of 21214036536537 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, five hundred thirty-seven".