21342124 has 6 divisors (see below), whose sum is σ = 37348724. Its totient is φ = 10671060.

The previous prime is 21342119. The next prime is 21342143. The reversal of 21342124 is 42124312.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2667762 + ... + 2667769.

Almost surely, 2^21342124 is an apocalyptic number.

It is an amenable number.

21342124 is a deficient number, since it is larger than the sum of its proper divisors (16006600).

21342124 is a wasteful number, since it uses less digits than its factorization.

21342124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5335535 (or 5335533 counting only the distinct ones).

The product of its digits is 384, while the sum is 19.

The square root of 21342124 is about 4619.7536730869. The cubic root of 21342124 is about 277.3825989330.

Adding to 21342124 its reverse (42124312), we get a palindrome (63466436).

The spelling of 21342124 in words is "twenty-one million, three hundred forty-two thousand, one hundred twenty-four".