21135042141 has 32 divisors (see below), whose sum is σ = 31805798400. Its totient is φ = 12404171520.

The previous prime is 21135042133. The next prime is 21135042163. The reversal of 21135042141 is 14124053112.

It is not a de Polignac number, because 21135042141 - 2³ = 21135042133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21135042191) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61495 + ... + 214596.

It is an arithmetic number, because the mean of its divisors is an integer number (993931200).

Almost surely, 2^21135042141 is an apocalyptic number.

It is an amenable number.

21135042141 is a deficient number, since it is larger than the sum of its proper divisors (10670756259).

21135042141 is a wasteful number, since it uses less digits than its factorization.

21135042141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276209.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21135042141 its reverse (14124053112), we get a palindrome (35259095253).

The spelling of 21135042141 in words is "twenty-one billion, one hundred thirty-five million, forty-two thousand, one hundred forty-one".