21113133100225 has 12 divisors (see below), whose sum is σ = 26887860316924. Its totient is φ = 16434006304320.

The previous prime is 21113133100211. The next prime is 21113133100237. The reversal of 21113133100225 is 52200133131112.

It can be written as a sum of positive squares in 6 ways, for example, as 699218733249 + 20413914366976 = 836193^2 + 4518176^2 .

It is not a de Polignac number, because 21113133100225 - 2⁷ = 21113133100097 is a prime.

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

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21113133100225.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11412503454 + ... + 11412505303.

Almost surely, 2^{21113133100225} is an apocalyptic number.

21113133100225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21113133100225 is a deficient number, since it is larger than the sum of its proper divisors (5774727216699).

21113133100225 is a wasteful number, since it uses less digits than its factorization.

21113133100225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22825008804 (or 22825008799 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

Adding to 21113133100225 its reverse (52200133131112), we get a palindrome (73313266231337).

The spelling of 21113133100225 in words is "twenty-one trillion, one hundred thirteen billion, one hundred thirty-three million, one hundred thousand, two hundred twenty-five".