21481844745525 has 12 divisors (see below), whose sum is σ = 35516649979392. Its totient is φ = 11456983864240.

The previous prime is 21481844745503. The next prime is 21481844745527. The reversal of 21481844745525 is 52554744818412.

It is a happy number.

It is not a de Polignac number, because 21481844745525 - 2⁷ = 21481844745397 is a prime.

It is a super-2 number, since 2×21481844745525² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21481844745527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143212298229 + ... + 143212298378.

It is an arithmetic number, because the mean of its divisors is an integer number (2959720831616).

Almost surely, 2^{21481844745525} is an apocalyptic number.

21481844745525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21481844745525 is a deficient number, since it is larger than the sum of its proper divisors (14034805233867).

21481844745525 is a wasteful number, since it uses less digits than its factorization.

21481844745525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286424596620 (or 286424596615 counting only the distinct ones).

The product of its digits is 57344000, while the sum is 60.

The spelling of 21481844745525 in words is "twenty-one trillion, four hundred eighty-one billion, eight hundred forty-four million, seven hundred forty-five thousand, five hundred twenty-five".