21044211325 has 12 divisors (see below), whose sum is σ = 26096627700. Its totient is φ = 16834204160.

The previous prime is 21044211289. The next prime is 21044211329. The reversal of 21044211325 is 52311244012.

It can be written as a sum of positive squares in 6 ways, for example, as 1868054841 + 19176156484 = 43221^2 + 138478^2 .

It is not a de Polignac number, because 21044211325 - 2²¹ = 21042114173 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 21044211325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21044211329) 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, 649101 + ... + 680749.

It is an arithmetic number, because the mean of its divisors is an integer number (2174718975).

Almost surely, 2^21044211325 is an apocalyptic number.

21044211325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21044211325 is a deficient number, since it is larger than the sum of its proper divisors (5052416375).

21044211325 is a wasteful number, since it uses less digits than its factorization.

21044211325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58256 (or 58251 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

Adding to 21044211325 its reverse (52311244012), we get a palindrome (73355455337).

The spelling of 21044211325 in words is "twenty-one billion, forty-four million, two hundred eleven thousand, three hundred twenty-five".