21404425007044 has 6 divisors (see below), whose sum is σ = 37457743762334. Its totient is φ = 10702212503520.

The previous prime is 21404425007027. The next prime is 21404425007047. The reversal of 21404425007044 is 44070052440412.

It can be written as a sum of positive squares in only one way, i.e., 18451423342144 + 2953001664900 = 4295512^2 + 1718430^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21404425006994 and 21404425007012.

It is not an unprimeable number, because it can be changed into a prime (21404425007047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2675553125877 + ... + 2675553125884.

Almost surely, 2^{21404425007044} is an apocalyptic number.

It is an amenable number.

21404425007044 is a deficient number, since it is larger than the sum of its proper divisors (16053318755290).

21404425007044 is a wasteful number, since it uses less digits than its factorization.

21404425007044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5351106251765 (or 5351106251763 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 37.

Adding to 21404425007044 its reverse (44070052440412), we get a palindrome (65474477447456).

The spelling of 21404425007044 in words is "twenty-one trillion, four hundred four billion, four hundred twenty-five million, seven thousand, forty-four".