21142529113 has 4 divisors (see below), whose sum is σ = 21336497380. Its totient is φ = 20948560848.

The previous prime is 21142529087. The next prime is 21142529137. The reversal of 21142529113 is 31192524112.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16671199689 + 4471329424 = 129117^2 + 66868^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142529113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21142529143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96983970 + ... + 96984187.

It is an arithmetic number, because the mean of its divisors is an integer number (5334124345).

Almost surely, 2^21142529113 is an apocalyptic number.

It is an amenable number.

21142529113 is a deficient number, since it is larger than the sum of its proper divisors (193968267).

21142529113 is a wasteful number, since it uses less digits than its factorization.

21142529113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193968266.

The product of its digits is 4320, while the sum is 31.

The spelling of 21142529113 in words is "twenty-one billion, one hundred forty-two million, five hundred twenty-nine thousand, one hundred thirteen".