21152450533 has 8 divisors (see below), whose sum is σ = 21682229760. Its totient is φ = 20625993360.

The previous prime is 21152450509. The next prime is 21152450551. The reversal of 21152450533 is 33505425112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21152450533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21152450495 and 21152450504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152450593) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 817618 + ... + 843091.

It is an arithmetic number, because the mean of its divisors is an integer number (2710278720).

Almost surely, 2^21152450533 is an apocalyptic number.

It is an amenable number.

21152450533 is a deficient number, since it is larger than the sum of its proper divisors (529779227).

21152450533 is a wasteful number, since it uses less digits than its factorization.

21152450533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661027.

The product of its (nonzero) digits is 18000, while the sum is 31.

Adding to 21152450533 its reverse (33505425112), we get a palindrome (54657875645).

The spelling of 21152450533 in words is "twenty-one billion, one hundred fifty-two million, four hundred fifty thousand, five hundred thirty-three".