21533413224 has 16 divisors (see below), whose sum is σ = 53833533120. Its totient is φ = 7177804400.

The previous prime is 21533413219. The next prime is 21533413249. The reversal of 21533413224 is 42231433512.

It is a junction number, because it is equal to n+sod(n) for n = 21533413191 and 21533413200.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 448612752 + ... + 448612799.

It is an arithmetic number, because the mean of its divisors is an integer number (3364595820).

Almost surely, 2^21533413224 is an apocalyptic number.

21533413224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21533413224 is an abundant number, since it is smaller than the sum of its proper divisors (32300119896).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21533413224 is a wasteful number, since it uses less digits than its factorization.

21533413224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897225560 (or 897225556 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

Adding to 21533413224 its reverse (42231433512), we get a palindrome (63764846736).

The spelling of 21533413224 in words is "twenty-one billion, five hundred thirty-three million, four hundred thirteen thousand, two hundred twenty-four".