21417401 has 4 divisors (see below), whose sum is σ = 21496704. Its totient is φ = 21338100.

The previous prime is 21417377. The next prime is 21417437. The reversal of 21417401 is 10471412.

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 21417401 - 2¹⁸ = 21155257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21417481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39245 + ... + 39786.

It is an arithmetic number, because the mean of its divisors is an integer number (5374176).

Almost surely, 2^21417401 is an apocalyptic number.

It is an amenable number.

21417401 is a deficient number, since it is larger than the sum of its proper divisors (79303).

21417401 is an equidigital number, since it uses as much as digits as its factorization.

21417401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79302.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 21417401 is about 4627.8937973986. The cubic root of 21417401 is about 277.7083401489.

Adding to 21417401 its reverse (10471412), we get a palindrome (31888813).

The spelling of 21417401 in words is "twenty-one million, four hundred seventeen thousand, four hundred one".