21349608 has 32 divisors (see below), whose sum is σ = 60999360. Its totient is φ = 6099840.

The previous prime is 21349591. The next prime is 21349621. The reversal of 21349608 is 80694312.

It is an unprimeable number.

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, 63373 + ... + 63708.

It is an arithmetic number, because the mean of its divisors is an integer number (1906230).

Almost surely, 2^21349608 is an apocalyptic number.

21349608 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21349608 is an abundant number, since it is smaller than the sum of its proper divisors (39649752).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21349608 is a wasteful number, since it uses less digits than its factorization.

21349608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127097 (or 127093 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 21349608 is about 4620.5636019862. The cubic root of 21349608 is about 277.4150182112.

The spelling of 21349608 in words is "twenty-one million, three hundred forty-nine thousand, six hundred eight".