21142136 has 32 divisors (see below), whose sum is σ = 41952000. Its totient is φ = 9961056.

The previous prime is 21142127. The next prime is 21142139. The reversal of 21142136 is 63124112.

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 7 ways as a sum of consecutive naturals, for example, 55595 + ... + 55973.

It is an arithmetic number, because the mean of its divisors is an integer number (1311000).

Almost surely, 2^21142136 is an apocalyptic number.

It is an amenable number.

21142136 is a deficient number, since it is larger than the sum of its proper divisors (20809864).

21142136 is a wasteful number, since it uses less digits than its factorization.

21142136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 767 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

The square root of 21142136 is about 4598.0578508757. The cubic root of 21142136 is about 276.5134669006.

Adding to 21142136 its reverse (63124112), we get a palindrome (84266248).

The spelling of 21142136 in words is "twenty-one million, one hundred forty-two thousand, one hundred thirty-six".