21042232 has 32 divisors (see below), whose sum is σ = 40590000. Its totient is φ = 10222848.

The previous prime is 21042223. The next prime is 21042251. The reversal of 21042232 is 23224012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51244 + ... + 51652.

Almost surely, 2^21042232 is an apocalyptic number.

It is an amenable number.

21042232 is a deficient number, since it is larger than the sum of its proper divisors (19547768).

21042232 is a wasteful number, since it uses less digits than its factorization.

21042232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21042232 is about 4587.1812695816. The cubic root of 21042232 is about 276.0772380624.

Adding to 21042232 its reverse (23224012), we get a palindrome (44266244).

The spelling of 21042232 in words is "twenty-one million, forty-two thousand, two hundred thirty-two".