21435532 has 12 divisors (see below), whose sum is σ = 38220336. Its totient is φ = 10515440.

The previous prime is 21435529. The next prime is 21435551. The reversal of 21435532 is 23553412.

It is a junction number, because it is equal to n+sod(n) for n = 21435497 and 21435506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50344 + ... + 50767.

It is an arithmetic number, because the mean of its divisors is an integer number (3185028).

Almost surely, 2^21435532 is an apocalyptic number.

It is an amenable number.

21435532 is a deficient number, since it is larger than the sum of its proper divisors (16784804).

21435532 is a wasteful number, since it uses less digits than its factorization.

21435532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101168 (or 101166 counting only the distinct ones).

The product of its digits is 3600, while the sum is 25.

The square root of 21435532 is about 4629.8522654616. The cubic root of 21435532 is about 277.7866831397.

Adding to 21435532 its reverse (23553412), we get a palindrome (44988944).

The spelling of 21435532 in words is "twenty-one million, four hundred thirty-five thousand, five hundred thirty-two".