21411204131 has 4 divisors (see below), whose sum is σ = 21933428664. Its totient is φ = 20888979600.

The previous prime is 21411204127. The next prime is 21411204161. The reversal of 21411204131 is 13140211412.

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

It is a cyclic number.

It is not a de Polignac number, because 21411204131 - 2² = 21411204127 is a prime.

It is a super-2 number, since 2×21411204131² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21411204161) 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, 261112205 + ... + 261112286.

It is an arithmetic number, because the mean of its divisors is an integer number (5483357166).

Almost surely, 2^21411204131 is an apocalyptic number.

21411204131 is a deficient number, since it is larger than the sum of its proper divisors (522224533).

21411204131 is an equidigital number, since it uses as much as digits as its factorization.

21411204131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522224532.

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

Adding to 21411204131 its reverse (13140211412), we get a palindrome (34551415543).

The spelling of 21411204131 in words is "twenty-one billion, four hundred eleven million, two hundred four thousand, one hundred thirty-one".