21303054225 has 18 divisors (see below), whose sum is σ = 38156137526. Its totient is φ = 11361628800.

The previous prime is 21303054191. The next prime is 21303054257. The reversal of 21303054225 is 52245030312.

It is a happy number.

21303054225 is a `hidden beast` number, since 2 + 130 + 305 + 4 + 225 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 76895361 + 21226158864 = 8769^2 + 145692^2 .

It is not a de Polignac number, because 21303054225 - 2¹⁰ = 21303053201 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 17 ways as a sum of consecutive naturals, for example, 47339896 + ... + 47340345.

Almost surely, 2^21303054225 is an apocalyptic number.

21303054225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21303054225 is a deficient number, since it is larger than the sum of its proper divisors (16853083301).

21303054225 is a wasteful number, since it uses less digits than its factorization.

21303054225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94680257 (or 94680249 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 27.

Adding to 21303054225 its reverse (52245030312), we get a palindrome (73548084537).

The spelling of 21303054225 in words is "twenty-one billion, three hundred three million, fifty-four thousand, two hundred twenty-five".