21131411406 has 48 divisors (see below), whose sum is σ = 50208926976. Its totient is φ = 5909083824.

The previous prime is 21131411401. The next prime is 21131411419. The reversal of 21131411406 is 60411413112.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131411401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 750816 + ... + 778451.

It is an arithmetic number, because the mean of its divisors is an integer number (1046019312).

Almost surely, 2^21131411406 is an apocalyptic number.

21131411406 is an abundant number, since it is smaller than the sum of its proper divisors (29077515570).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21131411406 is a wasteful number, since it uses less digits than its factorization.

21131411406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529333 (or 1529326 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

Adding to 21131411406 its reverse (60411413112), we get a palindrome (81542824518).

The spelling of 21131411406 in words is "twenty-one billion, one hundred thirty-one million, four hundred eleven thousand, four hundred six".