21110115410125 has 16 divisors (see below), whose sum is σ = 30109056037632. Its totient is φ = 14475507709200.

The previous prime is 21110115410117. The next prime is 21110115410129. The reversal of 21110115410125 is 52101451101112.

It is not a de Polignac number, because 21110115410125 - 2³ = 21110115410117 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 21110115410125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110115410129) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12062922217 + ... + 12062923966.

It is an arithmetic number, because the mean of its divisors is an integer number (1881816002352).

Almost surely, 2^{21110115410125} is an apocalyptic number.

21110115410125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21110115410125 is a deficient number, since it is larger than the sum of its proper divisors (8998940627507).

21110115410125 is an equidigital number, since it uses as much as digits as its factorization.

21110115410125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24125846205 (or 24125846195 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 25.

Adding to 21110115410125 its reverse (52101451101112), we get a palindrome (73211566511237).

The spelling of 21110115410125 in words is "twenty-one trillion, one hundred ten billion, one hundred fifteen million, four hundred ten thousand, one hundred twenty-five".