21001314135535 has 4 divisors (see below), whose sum is σ = 25201576962648. Its totient is φ = 16801051308424.

The previous prime is 21001314135521. The next prime is 21001314135539. The reversal of 21001314135535 is 53553141310012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21001314135535 - 2⁷ = 21001314135407 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 21001314135535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001314135539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100131413549 + ... + 2100131413558.

It is an arithmetic number, because the mean of its divisors is an integer number (6300394240662).

Almost surely, 2^{21001314135535} is an apocalyptic number.

21001314135535 is a deficient number, since it is larger than the sum of its proper divisors (4200262827113).

21001314135535 is an equidigital number, since it uses as much as digits as its factorization.

21001314135535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4200262827112.

The product of its (nonzero) digits is 27000, while the sum is 34.

Adding to 21001314135535 its reverse (53553141310012), we get a palindrome (74554455445547).

The spelling of 21001314135535 in words is "twenty-one trillion, one billion, three hundred fourteen million, one hundred thirty-five thousand, five hundred thirty-five".