21013002135 has 12 divisors (see below), whose sum is σ = 36422537112. Its totient is φ = 11206934448.

The previous prime is 21013002119. The next prime is 21013002137. The reversal of 21013002135 is 53120031012.

It is not a de Polignac number, because 21013002135 - 2⁴ = 21013002119 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21013002137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 233477757 + ... + 233477846.

It is an arithmetic number, because the mean of its divisors is an integer number (3035211426).

Almost surely, 2^21013002135 is an apocalyptic number.

21013002135 is a deficient number, since it is larger than the sum of its proper divisors (15409534977).

21013002135 is a wasteful number, since it uses less digits than its factorization.

21013002135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 466955614 (or 466955611 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

Adding to 21013002135 its reverse (53120031012), we get a palindrome (74133033147).

The spelling of 21013002135 in words is "twenty-one billion, thirteen million, two thousand, one hundred thirty-five".