21444503225 has 6 divisors (see below), whose sum is σ = 26591184030. Its totient is φ = 17155602560.

The previous prime is 21444503207. The next prime is 21444503281. The reversal of 21444503225 is 52230544412.

It can be written as a sum of positive squares in 3 ways, for example, as 155650576 + 21288852649 = 12476^2 + 145907^2 .

It is not a de Polignac number, because 21444503225 - 2⁶ = 21444503161 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21444503191 and 21444503200.

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 in 5 ways as a sum of consecutive naturals, for example, 428890040 + ... + 428890089.

It is an arithmetic number, because the mean of its divisors is an integer number (4431864005).

Almost surely, 2^21444503225 is an apocalyptic number.

21444503225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21444503225 is a deficient number, since it is larger than the sum of its proper divisors (5146680805).

21444503225 is an equidigital number, since it uses as much as digits as its factorization.

21444503225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857780139 (or 857780134 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

The spelling of 21444503225 in words is "twenty-one billion, four hundred forty-four million, five hundred three thousand, two hundred twenty-five".