221426617 has 4 divisors (see below), whose sum is σ = 221668480. Its totient is φ = 221184756.

The previous prime is 221426603. The next prime is 221426641. The reversal of 221426617 is 716624122.

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, and also an emirpimes, since its reverse is a distinct semiprime: 716624122 = 2 ⋅358312061.

It is a cyclic number.

It is not a de Polignac number, because 221426617 - 2⁷ = 221426489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221426417) 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, 119553 + ... + 121390.

It is an arithmetic number, because the mean of its divisors is an integer number (55417120).

Almost surely, 2^221426617 is an apocalyptic number.

It is an amenable number.

221426617 is a deficient number, since it is larger than the sum of its proper divisors (241863).

221426617 is an equidigital number, since it uses as much as digits as its factorization.

221426617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241862.

The product of its digits is 8064, while the sum is 31.

The square root of 221426617 is about 14880.4105118105. The cubic root of 221426617 is about 604.9831445797.

The spelling of 221426617 in words is "two hundred twenty-one million, four hundred twenty-six thousand, six hundred seventeen".