21162652025444 has 12 divisors (see below), whose sum is σ = 37034792749164. Its totient is φ = 10581282668544.

The previous prime is 21162652025429. The next prime is 21162652025461. The reversal of 21162652025444 is 44452025626112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13268170502500 + 7894481522944 = 3642550^2 + 2809712^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21162652025395 and 21162652025404.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9724829 + ... + 11700324.

It is an arithmetic number, because the mean of its divisors is an integer number (3086232729097).

Almost surely, 2^{21162652025444} is an apocalyptic number.

It is an amenable number.

21162652025444 is a deficient number, since it is larger than the sum of its proper divisors (15872140723720).

21162652025444 is a wasteful number, since it uses less digits than its factorization.

21162652025444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21672094 (or 21672092 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 44.

The spelling of 21162652025444 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty-two million, twenty-five thousand, four hundred forty-four".