217213401 has 4 divisors (see below), whose sum is σ = 289617872. Its totient is φ = 144808932.

The previous prime is 217213387. The next prime is 217213411. The reversal of 217213401 is 104312712.

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 not a de Polignac number, because 217213401 - 2¹⁸ = 216951257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (217213411) 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, 36202231 + ... + 36202236.

It is an arithmetic number, because the mean of its divisors is an integer number (72404468).

Almost surely, 2^217213401 is an apocalyptic number.

It is an amenable number.

217213401 is a deficient number, since it is larger than the sum of its proper divisors (72404471).

217213401 is an equidigital number, since it uses as much as digits as its factorization.

217213401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72404470.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 217213401 is about 14738.1613846504. The cubic root of 217213401 is about 601.1214221592.

The spelling of 217213401 in words is "two hundred seventeen million, two hundred thirteen thousand, four hundred one".