21340124 has 12 divisors (see below), whose sum is σ = 40218024. Its totient is φ = 9849264.

The previous prime is 21340093. The next prime is 21340141. The reversal of 21340124 is 42104312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205142 + ... + 205245.

It is an arithmetic number, because the mean of its divisors is an integer number (3351502).

Almost surely, 2^21340124 is an apocalyptic number.

It is an amenable number.

21340124 is a deficient number, since it is larger than the sum of its proper divisors (18877900).

21340124 is a wasteful number, since it uses less digits than its factorization.

21340124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410404 (or 410402 counting only the distinct ones).

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

The square root of 21340124 is about 4619.5372062578. The cubic root of 21340124 is about 277.3739340265.

Adding to 21340124 its reverse (42104312), we get a palindrome (63444436).

The spelling of 21340124 in words is "twenty-one million, three hundred forty thousand, one hundred twenty-four".