21417001 has 4 divisors (see below), whose sum is σ = 22107904. Its totient is φ = 20726100.

The previous prime is 21416999. The next prime is 21417023. The reversal of 21417001 is 10071412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21417001 - 2¹ = 21416999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21417031) 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 3 ways as a sum of consecutive naturals, for example, 345405 + ... + 345466.

It is an arithmetic number, because the mean of its divisors is an integer number (5526976).

Almost surely, 2^21417001 is an apocalyptic number.

It is an amenable number.

21417001 is a deficient number, since it is larger than the sum of its proper divisors (690903).

21417001 is an equidigital number, since it uses as much as digits as its factorization.

21417001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690902.

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

The square root of 21417001 is about 4627.8505809933. The cubic root of 21417001 is about 277.7066112739.

Adding to 21417001 its reverse (10071412), we get a palindrome (31488413).

The spelling of 21417001 in words is "twenty-one million, four hundred seventeen thousand, one".