21250144440004 has 6 divisors (see below), whose sum is σ = 37187752770014. Its totient is φ = 10625072220000.

The previous prime is 21250144439987. The next prime is 21250144440011. The reversal of 21250144440004 is 40004444105212.

It can be written as a sum of positive squares in only one way, i.e., 20456081665600 + 794062774404 = 4522840^2 + 891102^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2656268054997 + ... + 2656268055004.

Almost surely, 2^{21250144440004} is an apocalyptic number.

It is an amenable number.

21250144440004 is a deficient number, since it is larger than the sum of its proper divisors (15937608330010).

21250144440004 is a wasteful number, since it uses less digits than its factorization.

21250144440004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5312536110005 (or 5312536110003 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 31.

Adding to 21250144440004 its reverse (40004444105212), we get a palindrome (61254588545216).

The spelling of 21250144440004 in words is "twenty-one trillion, two hundred fifty billion, one hundred forty-four million, four hundred forty thousand, four".