21533500324445 has 32 divisors (see below), whose sum is σ = 26169268285440. Its totient is φ = 17008807490560.

The previous prime is 21533500324429. The next prime is 21533500324451. The reversal of 21533500324445 is 54442300533512.

It is not a de Polignac number, because 21533500324445 - 2⁴ = 21533500324429 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 (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1349293376 + ... + 1349309334.

It is an arithmetic number, because the mean of its divisors is an integer number (817789633920).

Almost surely, 2^{21533500324445} is an apocalyptic number.

It is an amenable number.

21533500324445 is a deficient number, since it is larger than the sum of its proper divisors (4635767960995).

21533500324445 is a wasteful number, since it uses less digits than its factorization.

21533500324445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26605.

The product of its (nonzero) digits is 864000, while the sum is 41.

Adding to 21533500324445 its reverse (54442300533512), we get a palindrome (75975800857957).

The spelling of 21533500324445 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred million, three hundred twenty-four thousand, four hundred forty-five".