21342908 has 12 divisors (see below), whose sum is σ = 37397472. Its totient is φ = 10657920.

The previous prime is 21342907. The next prime is 21342943. The reversal of 21342908 is 80924312.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342901) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 716 + ... + 6572.

It is an arithmetic number, because the mean of its divisors is an integer number (3116456).

Almost surely, 2^21342908 is an apocalyptic number.

It is an amenable number.

21342908 is a deficient number, since it is larger than the sum of its proper divisors (16054564).

21342908 is a wasteful number, since it uses less digits than its factorization.

21342908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6772 (or 6770 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 21342908 is about 4619.8385253167. The cubic root of 21342908 is about 277.3859954287.

The spelling of 21342908 in words is "twenty-one million, three hundred forty-two thousand, nine hundred eight".