21168413 has 8 divisors (see below), whose sum is σ = 25465920. Its totient is φ = 17189280.

The previous prime is 21168409. The next prime is 21168439. The reversal of 21168413 is 31486112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21168413 - 2² = 21168409 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21168113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79448 + ... + 79713.

It is an arithmetic number, because the mean of its divisors is an integer number (3183240).

Almost surely, 2^21168413 is an apocalyptic number.

It is an amenable number.

21168413 is a deficient number, since it is larger than the sum of its proper divisors (4297507).

21168413 is a wasteful number, since it uses less digits than its factorization.

21168413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159187.

The product of its digits is 1152, while the sum is 26.

The square root of 21168413 is about 4600.9143656452. The cubic root of 21168413 is about 276.6279765577.

The spelling of 21168413 in words is "twenty-one million, one hundred sixty-eight thousand, four hundred thirteen".