217122401 has 8 divisors (see below), whose sum is σ = 223184640. Its totient is φ = 211070448.

The previous prime is 217122383. The next prime is 217122431. The reversal of 217122401 is 104221712.

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 217122401 - 2⁶ = 217122337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217122431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62960 + ... + 66318.

It is an arithmetic number, because the mean of its divisors is an integer number (27898080).

Almost surely, 2^217122401 is an apocalyptic number.

It is an amenable number.

217122401 is a deficient number, since it is larger than the sum of its proper divisors (6062239).

217122401 is a wasteful number, since it uses less digits than its factorization.

217122401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143.

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

The square root of 217122401 is about 14735.0738376162. The cubic root of 217122401 is about 601.0374652610.

The spelling of 217122401 in words is "two hundred seventeen million, one hundred twenty-two thousand, four hundred one".