21142232 has 16 divisors (see below), whose sum is σ = 39803400. Its totient is φ = 10528000.

The previous prime is 21142223. The next prime is 21142243. The reversal of 21142232 is 23224112.

It is a self number, because there is not a number n which added to its sum of digits gives 21142232.

It is a congruent number.

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 in 3 ways as a sum of consecutive naturals, for example, 3257 + ... + 7272.

Almost surely, 2^21142232 is an apocalyptic number.

It is an amenable number.

21142232 is a deficient number, since it is larger than the sum of its proper divisors (18661168).

21142232 is a wasteful number, since it uses less digits than its factorization.

21142232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10786 (or 10782 counting only the distinct ones).

The product of its digits is 192, while the sum is 17.

The square root of 21142232 is about 4598.0682900540. The cubic root of 21142232 is about 276.5138854211.

Adding to 21142232 its reverse (23224112), we get a palindrome (44366344).

The spelling of 21142232 in words is "twenty-one million, one hundred forty-two thousand, two hundred thirty-two".