21401401440125 has 16 divisors (see below), whose sum is σ = 30524513140992. Its totient is φ = 14675246701200.

The previous prime is 21401401440113. The next prime is 21401401440127. The reversal of 21401401440125 is 52104410410412.

It is not a de Polignac number, because 21401401440125 - 2⁶ = 21401401440061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401401440127) 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, 12229371377 + ... + 12229373126.

It is an arithmetic number, because the mean of its divisors is an integer number (1907782071312).

Almost surely, 2^{21401401440125} is an apocalyptic number.

21401401440125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21401401440125 is a deficient number, since it is larger than the sum of its proper divisors (9123111700867).

21401401440125 is an equidigital number, since it uses as much as digits as its factorization.

21401401440125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24458744525 (or 24458744515 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 29.

Adding to 21401401440125 its reverse (52104410410412), we get a palindrome (73505811850537).

The spelling of 21401401440125 in words is "twenty-one trillion, four hundred one billion, four hundred one million, four hundred forty thousand, one hundred twenty-five".