21316001 has 8 divisors (see below), whose sum is σ = 24408384. Its totient is φ = 18235440.

The previous prime is 21315997. The next prime is 21316021. The reversal of 21316001 is 10061312.

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 21316001 - 2² = 21315997 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21316021) 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, 1331 + ... + 6663.

It is an arithmetic number, because the mean of its divisors is an integer number (3051048).

Almost surely, 2^21316001 is an apocalyptic number.

It is an amenable number.

21316001 is a deficient number, since it is larger than the sum of its proper divisors (3092383).

21316001 is an equidigital number, since it uses as much as digits as its factorization.

21316001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5911.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21316001 is about 4616.9254921430. The cubic root of 21316001 is about 277.2693795855.

Adding to 21316001 its reverse (10061312), we get a palindrome (31377313).

The spelling of 21316001 in words is "twenty-one million, three hundred sixteen thousand, one".