21204131141 has 4 divisors (see below), whose sum is σ = 21223532172. Its totient is φ = 21184730112.

The previous prime is 21204131131. The next prime is 21204131149. The reversal of 21204131141 is 14113140212.

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 12577622500 + 8626508641 = 112150^2 + 92879^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21204131141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204131149) 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, 9698876 + ... + 9701061.

It is an arithmetic number, because the mean of its divisors is an integer number (5305883043).

Almost surely, 2^21204131141 is an apocalyptic number.

It is an amenable number.

21204131141 is a deficient number, since it is larger than the sum of its proper divisors (19401031).

21204131141 is a wasteful number, since it uses less digits than its factorization.

21204131141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19401030.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21204131141 its reverse (14113140212), we get a palindrome (35317271353).

The spelling of 21204131141 in words is "twenty-one billion, two hundred four million, one hundred thirty-one thousand, one hundred forty-one".