21404404134 has 24 divisors (see below), whose sum is σ = 48817062840. Its totient is φ = 6759285408.

The previous prime is 21404404123. The next prime is 21404404139. The reversal of 21404404134 is 43140440412.

21404404134 is a `hidden beast` number, since 214 + 0 + 440 + 4 + 1 + 3 + 4 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21404404098 and 21404404107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404404139) 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, 31292647 + ... + 31293330.

It is an arithmetic number, because the mean of its divisors is an integer number (2034044285).

Almost surely, 2^21404404134 is an apocalyptic number.

21404404134 is an abundant number, since it is smaller than the sum of its proper divisors (27412658706).

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

21404404134 is a wasteful number, since it uses less digits than its factorization.

21404404134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62586004 (or 62586001 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21404404134 its reverse (43140440412), we get a palindrome (64544844546).

The spelling of 21404404134 in words is "twenty-one billion, four hundred four million, four hundred four thousand, one hundred thirty-four".