21142132 has 12 divisors (see below), whose sum is σ = 40362336. Its totient is φ = 9610040.

The previous prime is 21142127. The next prime is 21142139. The reversal of 21142132 is 23124112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142139) by changing a digit.

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, 240208 + ... + 240295.

It is an arithmetic number, because the mean of its divisors is an integer number (3363528).

Almost surely, 2^21142132 is an apocalyptic number.

21142132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21142132 is a deficient number, since it is larger than the sum of its proper divisors (19220204).

21142132 is a wasteful number, since it uses less digits than its factorization.

21142132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 480518 (or 480516 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21142132 is about 4598.0574159095. The cubic root of 21142132 is about 276.5134494623.

Adding to 21142132 its reverse (23124112), we get a palindrome (44266244).

The spelling of 21142132 in words is "twenty-one million, one hundred forty-two thousand, one hundred thirty-two".