21201040135 has 64 divisors (see below), whose sum is σ = 29061711360. Its totient is φ = 14712768000.

The previous prime is 21201040109. The next prime is 21201040139. The reversal of 21201040135 is 53104010212.

It is not a de Polignac number, because 21201040135 - 2¹¹ = 21201038087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201040139) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25823025 + ... + 25823845.

It is an arithmetic number, because the mean of its divisors is an integer number (454089240).

Almost surely, 2^21201040135 is an apocalyptic number.

21201040135 is a deficient number, since it is larger than the sum of its proper divisors (7860671225).

21201040135 is a wasteful number, since it uses less digits than its factorization.

21201040135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120.

The product of its (nonzero) digits is 240, while the sum is 19.

Adding to 21201040135 its reverse (53104010212), we get a palindrome (74305050347).

The spelling of 21201040135 in words is "twenty-one billion, two hundred one million, forty thousand, one hundred thirty-five".