21608119 has 4 divisors (see below), whose sum is σ = 23270296. Its totient is φ = 19945944.

The previous prime is 21608113. The next prime is 21608123. The reversal of 21608119 is 91180612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21608119 - 2⁷ = 21607991 is a prime.

It is a super-2 number, since 2×21608119² = 933821613436322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21608113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 831069 + ... + 831094.

It is an arithmetic number, because the mean of its divisors is an integer number (5817574).

Almost surely, 2^21608119 is an apocalyptic number.

21608119 is a deficient number, since it is larger than the sum of its proper divisors (1662177).

21608119 is a wasteful number, since it uses less digits than its factorization.

21608119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662176.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 21608119 is about 4648.4533987123. The cubic root of 21608119 is about 278.5302192196.

The spelling of 21608119 in words is "twenty-one million, six hundred eight thousand, one hundred nineteen".