21041344132135 has 4 divisors (see below), whose sum is σ = 25249612958568. Its totient is φ = 16833075305704.

The previous prime is 21041344132117. The next prime is 21041344132163. The reversal of 21041344132135 is 53123144314012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21041344132135 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 21041344132135.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2104134413209 + ... + 2104134413218.

It is an arithmetic number, because the mean of its divisors is an integer number (6312403239642).

Almost surely, 2^{21041344132135} is an apocalyptic number.

21041344132135 is a deficient number, since it is larger than the sum of its proper divisors (4208268826433).

21041344132135 is an equidigital number, since it uses as much as digits as its factorization.

21041344132135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208268826432.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21041344132135 its reverse (53123144314012), we get a palindrome (74164488446147).

The spelling of 21041344132135 in words is "twenty-one trillion, forty-one billion, three hundred forty-four million, one hundred thirty-two thousand, one hundred thirty-five".