21443541000452 has 12 divisors (see below), whose sum is σ = 37526229307980. Its totient is φ = 10721761198176.

The previous prime is 21443541000373. The next prime is 21443541000521. The reversal of 21443541000452 is 25400014534412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9709244113156 + 11734296887296 = 3115966^2 + 3425536^2 .

It is a super-2 number, since 2×21443541000452² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7162418 + ... + 9705014.

It is an arithmetic number, because the mean of its divisors is an integer number (3127185775665).

Almost surely, 2^{21443541000452} is an apocalyptic number.

It is an amenable number.

21443541000452 is a deficient number, since it is larger than the sum of its proper divisors (16082688307528).

21443541000452 is a wasteful number, since it uses less digits than its factorization.

21443541000452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4651030 (or 4651028 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 35.

Adding to 21443541000452 its reverse (25400014534412), we get a palindrome (46843555534864).

The spelling of 21443541000452 in words is "twenty-one trillion, four hundred forty-three billion, five hundred forty-one million, four hundred fifty-two", and thus it is an aban number.