21122017 has 8 divisors (see below), whose sum is σ = 24198912. Its totient is φ = 18060000.

The previous prime is 21122009. The next prime is 21122033. The reversal of 21122017 is 71022112.

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

It is not a de Polignac number, because 21122017 - 2³ = 21122009 is a prime.

It is a super-2 number, since 2×21122017² = 892279204296578, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120017) 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 in 7 ways as a sum of consecutive naturals, for example, 484 + ... + 6517.

It is an arithmetic number, because the mean of its divisors is an integer number (3024864).

Almost surely, 2^21122017 is an apocalyptic number.

It is an amenable number.

21122017 is a deficient number, since it is larger than the sum of its proper divisors (3076895).

21122017 is an equidigital number, since it uses as much as digits as its factorization.

21122017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7439.

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 21122017 is about 4595.8695586363. The cubic root of 21122017 is about 276.4257283671.

Adding to 21122017 its reverse (71022112), we get a palindrome (92144129).

The spelling of 21122017 in words is "twenty-one million, one hundred twenty-two thousand, seventeen".