21115135325141 has 12 divisors (see below), whose sum is σ = 24994521283116. Its totient is φ = 17718994677120.

The previous prime is 21115135325117. The next prime is 21115135325173. The reversal of 21115135325141 is 14152353151112.

It can be written as a sum of positive squares in 2 ways, for example, as 2665232562916 + 18449902762225 = 1632554^2 + 4295335^2 .

It is not a de Polignac number, because 21115135325141 - 2⁶ = 21115135325077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115135325441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6711738836 + ... + 6711741981.

It is an arithmetic number, because the mean of its divisors is an integer number (2082876773593).

Almost surely, 2^{21115135325141} is an apocalyptic number.

It is an amenable number.

21115135325141 is a deficient number, since it is larger than the sum of its proper divisors (3879385957975).

21115135325141 is a wasteful number, since it uses less digits than its factorization.

21115135325141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13423480852 (or 13423480841 counting only the distinct ones).

The product of its digits is 18000, while the sum is 35.

Adding to 21115135325141 its reverse (14152353151112), we get a palindrome (35267488476253).

The spelling of 21115135325141 in words is "twenty-one trillion, one hundred fifteen billion, one hundred thirty-five million, three hundred twenty-five thousand, one hundred forty-one".