21168007 has 8 divisors (see below), whose sum is σ = 24369696. Its totient is φ = 18010752.

The previous prime is 21167989. The next prime is 21168023. The reversal of 21168007 is 70086112.

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 21168007 - 2²³ = 12779399 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 (21162007) 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, 10078 + ... + 11995.

It is an arithmetic number, because the mean of its divisors is an integer number (3046212).

Almost surely, 2^21168007 is an apocalyptic number.

21168007 is a deficient number, since it is larger than the sum of its proper divisors (3201689).

21168007 is a wasteful number, since it uses less digits than its factorization.

21168007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22217.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 21168007 is about 4600.8702437691. The cubic root of 21168007 is about 276.6262080158.

The spelling of 21168007 in words is "twenty-one million, one hundred sixty-eight thousand, seven".