21441253125 has 48 divisors (see below), whose sum is σ = 36494164224. Its totient is φ = 11191800000.

The previous prime is 21441253121. The next prime is 21441253147. The reversal of 21441253125 is 52135214412.

It is not a de Polignac number, because 21441253125 - 2² = 21441253121 is a prime.

It is a super-3 number, since 3×21441253125³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21441253092 and 21441253101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441253121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 416295 + ... + 464955.

It is an arithmetic number, because the mean of its divisors is an integer number (760295088).

Almost surely, 2^21441253125 is an apocalyptic number.

21441253125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21441253125 is a deficient number, since it is larger than the sum of its proper divisors (15052911099).

21441253125 is an frugal number, since it uses more digits than its factorization.

21441253125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48736 (or 48716 counting only the distinct ones).

The product of its digits is 9600, while the sum is 30.

Adding to 21441253125 its reverse (52135214412), we get a palindrome (73576467537).

The spelling of 21441253125 in words is "twenty-one billion, four hundred forty-one million, two hundred fifty-three thousand, one hundred twenty-five".