21242632 has 32 divisors (see below), whose sum is σ = 40824000. Its totient is φ = 10360000.

The previous prime is 21242629. The next prime is 21242651. The reversal of 21242632 is 23624212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84507 + ... + 84757.

It is an arithmetic number, because the mean of its divisors is an integer number (1275750).

Almost surely, 2^21242632 is an apocalyptic number.

It is an amenable number.

21242632 is a deficient number, since it is larger than the sum of its proper divisors (19581368).

21242632 is a wasteful number, since it uses less digits than its factorization.

21242632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477 (or 473 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 21242632 is about 4608.9729875537. The cubic root of 21242632 is about 276.9508964296.

Adding to 21242632 its reverse (23624212), we get a palindrome (44866844).

The spelling of 21242632 in words is "twenty-one million, two hundred forty-two thousand, six hundred thirty-two".