21113400423025 has 6 divisors (see below), whose sum is σ = 26180616524582. Its totient is φ = 16890720338400.

The previous prime is 21113400422993. The next prime is 21113400423103. The reversal of 21113400423025 is 52032400431112.

It can be written as a sum of positive squares in 3 ways, for example, as 3052064904256 + 18061335518769 = 1747016^2 + 4249863^2 .

It is not a de Polignac number, because 21113400423025 - 2⁵ = 21113400422993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21113400422984 and 21113400423002.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 422268008436 + ... + 422268008485.

Almost surely, 2^{21113400423025} is an apocalyptic number.

21113400423025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21113400423025 is a deficient number, since it is larger than the sum of its proper divisors (5067216101557).

21113400423025 is an equidigital number, since it uses as much as digits as its factorization.

21113400423025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844536016931 (or 844536016926 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 21113400423025 its reverse (52032400431112), we get a palindrome (73145800854137).

The spelling of 21113400423025 in words is "twenty-one trillion, one hundred thirteen billion, four hundred million, four hundred twenty-three thousand, twenty-five".