21435748 has 6 divisors (see below), whose sum is σ = 37512566. Its totient is φ = 10717872.

The previous prime is 21435737. The next prime is 21435751. The reversal of 21435748 is 84753412.

It can be written as a sum of positive squares in only one way, i.e., 19027044 + 2408704 = 4362^2 + 1552^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2679465 + ... + 2679472.

Almost surely, 2^21435748 is an apocalyptic number.

It is an amenable number.

21435748 is a deficient number, since it is larger than the sum of its proper divisors (16076818).

21435748 is a wasteful number, since it uses less digits than its factorization.

21435748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5358941 (or 5358939 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 21435748 is about 4629.8755922811. The cubic root of 21435748 is about 277.7876161967.

The spelling of 21435748 in words is "twenty-one million, four hundred thirty-five thousand, seven hundred forty-eight".