21131404011 has 10 divisors (see below), whose sum is σ = 31566665372. Its totient is φ = 14087602620.

The previous prime is 21131404001. The next prime is 21131404051. The reversal of 21131404011 is 11040413112.

It is not a de Polignac number, because 21131404011 - 2¹³ = 21131395819 is a prime.

It is a super-2 number, since 2×21131404011² (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 (21131404001) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 130440685 + ... + 130440846.

Almost surely, 2^21131404011 is an apocalyptic number.

21131404011 is a deficient number, since it is larger than the sum of its proper divisors (10435261361).

21131404011 is an equidigital number, since it uses as much as digits as its factorization.

21131404011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260881543 (or 260881534 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21131404011 its reverse (11040413112), we get a palindrome (32171817123).

The spelling of 21131404011 in words is "twenty-one billion, one hundred thirty-one million, four hundred four thousand, eleven".