21013200135 has 24 divisors (see below), whose sum is σ = 36428780544. Its totient is φ = 11205224640.

The previous prime is 21013200127. The next prime is 21013200167. The reversal of 21013200135 is 53100231012.

21013200135 is a `hidden beast` number, since 210 + 1 + 320 + 0 + 135 = 666.

It is not a de Polignac number, because 21013200135 - 2³ = 21013200127 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 270714 + ... + 339576.

It is an arithmetic number, because the mean of its divisors is an integer number (1517865856).

Almost surely, 2^21013200135 is an apocalyptic number.

21013200135 is a deficient number, since it is larger than the sum of its proper divisors (15415580409).

21013200135 is a wasteful number, since it uses less digits than its factorization.

21013200135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75655 (or 75652 counting only the distinct ones).

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

Adding to 21013200135 its reverse (53100231012), we get a palindrome (74113431147).

The spelling of 21013200135 in words is "twenty-one billion, thirteen million, two hundred thousand, one hundred thirty-five".