21608492 has 6 divisors (see below), whose sum is σ = 37814868. Its totient is φ = 10804244.

The previous prime is 21608467. The next prime is 21608497. The reversal of 21608492 is 29480612.

It is not an unprimeable number, because it can be changed into a prime (21608497) 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 as a sum of consecutive naturals, namely, 2701058 + ... + 2701065.

It is an arithmetic number, because the mean of its divisors is an integer number (6302478).

Almost surely, 2^21608492 is an apocalyptic number.

It is an amenable number.

21608492 is a deficient number, since it is larger than the sum of its proper divisors (16206376).

21608492 is a wasteful number, since it uses less digits than its factorization.

21608492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5402127 (or 5402125 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 21608492 is about 4648.4935194103. The cubic root of 21608492 is about 278.5318218760.

The spelling of 21608492 in words is "twenty-one million, six hundred eight thousand, four hundred ninety-two".