21443030312125 has 16 divisors (see below), whose sum is σ = 26761434073920. Its totient is φ = 17154083067600.

The previous prime is 21443030312107. The next prime is 21443030312141. The reversal of 21443030312125 is 52121303034412.

It is a de Polignac number, because none of the positive numbers 2^k-21443030312125 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 4699986 + ... + 8060764.

It is an arithmetic number, because the mean of its divisors is an integer number (1672589629620).

Almost surely, 2^{21443030312125} is an apocalyptic number.

21443030312125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21443030312125 is a deficient number, since it is larger than the sum of its proper divisors (5318403761795).

21443030312125 is an equidigital number, since it uses as much as digits as its factorization.

21443030312125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411837 (or 3411827 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

Adding to 21443030312125 its reverse (52121303034412), we get a palindrome (73564333346537).

The spelling of 21443030312125 in words is "twenty-one trillion, four hundred forty-three billion, thirty million, three hundred twelve thousand, one hundred twenty-five".