21404131024 has 10 divisors (see below), whose sum is σ = 41470503890. Its totient is φ = 10702065504.

The previous prime is 21404131013. The next prime is 21404131043. The reversal of 21404131024 is 42013140412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14443232400 + 6960898624 = 120180^2 + 83432^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21404130986 and 21404131004.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 668879079 + ... + 668879110.

It is an arithmetic number, because the mean of its divisors is an integer number (4147050389).

Almost surely, 2^21404131024 is an apocalyptic number.

It is an amenable number.

21404131024 is a deficient number, since it is larger than the sum of its proper divisors (20066372866).

21404131024 is a wasteful number, since it uses less digits than its factorization.

21404131024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337758197 (or 1337758191 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21404131024 its reverse (42013140412), we get a palindrome (63417271436).

The spelling of 21404131024 in words is "twenty-one billion, four hundred four million, one hundred thirty-one thousand, twenty-four".