21013062535 has 16 divisors (see below), whose sum is σ = 25638135840. Its totient is φ = 16529005440.

The previous prime is 21013062523. The next prime is 21013062557. The reversal of 21013062535 is 53526031012.

It is a de Polignac number, because none of the positive numbers 2^k-21013062535 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 981576 + ... + 1002754.

It is an arithmetic number, because the mean of its divisors is an integer number (1602383490).

Almost surely, 2^21013062535 is an apocalyptic number.

21013062535 is a deficient number, since it is larger than the sum of its proper divisors (4625073305).

21013062535 is a wasteful number, since it uses less digits than its factorization.

21013062535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24498.

The product of its (nonzero) digits is 5400, while the sum is 28.

Adding to 21013062535 its reverse (53526031012), we get a palindrome (74539093547).

The spelling of 21013062535 in words is "twenty-one billion, thirteen million, sixty-two thousand, five hundred thirty-five".