21533445532 has 6 divisors (see below), whose sum is σ = 37683529688. Its totient is φ = 10766722764.

The previous prime is 21533445523. The next prime is 21533445569. The reversal of 21533445532 is 23554433512.

It is a super-3 number, since 3×21533445532³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21533445491 and 21533445500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2691680688 + ... + 2691680695.

Almost surely, 2^21533445532 is an apocalyptic number.

It is an amenable number.

21533445532 is a deficient number, since it is larger than the sum of its proper divisors (16150084156).

21533445532 is a wasteful number, since it uses less digits than its factorization.

21533445532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5383361387 (or 5383361385 counting only the distinct ones).

The product of its digits is 216000, while the sum is 37.

The spelling of 21533445532 in words is "twenty-one billion, five hundred thirty-three million, four hundred forty-five thousand, five hundred thirty-two".