21407417 has 8 divisors (see below), whose sum is σ = 21717696. Its totient is φ = 21099312.

The previous prime is 21407387. The next prime is 21407467. The reversal of 21407417 is 71470412.

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 21407417 - 2¹⁴ = 21391033 is a prime.

It is a super-2 number, since 2×21407417² = 916555005223778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21407467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31283 + ... + 31959.

It is an arithmetic number, because the mean of its divisors is an integer number (2714712).

Almost surely, 2^21407417 is an apocalyptic number.

It is an amenable number.

21407417 is a deficient number, since it is larger than the sum of its proper divisors (310279).

21407417 is a wasteful number, since it uses less digits than its factorization.

21407417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1087.

The product of its (nonzero) digits is 1568, while the sum is 26.

The square root of 21407417 is about 4626.8149952208. The cubic root of 21407417 is about 277.6651809904.

Adding to 21407417 its reverse (71470412), we get a palindrome (92877829).

The spelling of 21407417 in words is "twenty-one million, four hundred seven thousand, four hundred seventeen".