21214036536535 has 32 divisors (see below), whose sum is σ = 27138928320000. Its totient is φ = 15872933425536.

The previous prime is 21214036536493. The next prime is 21214036536551. The reversal of 21214036536535 is 53563563041212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21214036536535 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10069561 + ... + 11992669.

It is an arithmetic number, because the mean of its divisors is an integer number (848091510000).

Almost surely, 2^{21214036536535} is an apocalyptic number.

21214036536535 is a deficient number, since it is larger than the sum of its proper divisors (5924891783465).

21214036536535 is a wasteful number, since it uses less digits than its factorization.

21214036536535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924615.

The product of its (nonzero) digits is 1944000, while the sum is 46.

Adding to 21214036536535 its reverse (53563563041212), we get a palindrome (74777599577747).

The spelling of 21214036536535 in words is "twenty-one trillion, two hundred fourteen billion, thirty-six million, five hundred thirty-six thousand, five hundred thirty-five".