21533524430 has 32 divisors (see below), whose sum is σ = 42671962080. Its totient is φ = 7758529920.

The previous prime is 21533524423. The next prime is 21533524471. The reversal of 21533524430 is 3442533512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 885989 + ... + 909968.

It is an arithmetic number, because the mean of its divisors is an integer number (1333498815).

Almost surely, 2^21533524430 is an apocalyptic number.

21533524430 is a deficient number, since it is larger than the sum of its proper divisors (21138437650).

21533524430 is a wasteful number, since it uses less digits than its factorization.

21533524430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796084.

The product of its (nonzero) digits is 43200, while the sum is 32.

The spelling of 21533524430 in words is "twenty-one billion, five hundred thirty-three million, five hundred twenty-four thousand, four hundred thirty".