217046421 has 12 divisors (see below), whose sum is σ = 313680640. Its totient is φ = 144619560.

The previous prime is 217046419. The next prime is 217046461. The reversal of 217046421 is 124640712.

217046421 is a `hidden beast` number, since 2 + 17 + 0 + 4 + 642 + 1 = 666.

It is not a de Polignac number, because 217046421 - 2¹ = 217046419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217046461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14766 + ... + 25536.

Almost surely, 2^217046421 is an apocalyptic number.

It is an amenable number.

217046421 is a deficient number, since it is larger than the sum of its proper divisors (96634219).

217046421 is a wasteful number, since it uses less digits than its factorization.

217046421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13016 (or 13013 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 217046421 is about 14732.4954098075. The cubic root of 217046421 is about 600.9673478919.

The spelling of 217046421 in words is "two hundred seventeen million, forty-six thousand, four hundred twenty-one".