217060421 has 4 divisors (see below), whose sum is σ = 218360352. Its totient is φ = 215760492.

The previous prime is 217060381. The next prime is 217060423. The reversal of 217060421 is 124060712.

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 217060421 - 2¹⁰ = 217059397 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 (217060423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 649715 + ... + 650048.

It is an arithmetic number, because the mean of its divisors is an integer number (54590088).

Almost surely, 2^217060421 is an apocalyptic number.

It is an amenable number.

217060421 is a deficient number, since it is larger than the sum of its proper divisors (1299931).

217060421 is a wasteful number, since it uses less digits than its factorization.

217060421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299930.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 217060421 is about 14732.9705422905. The cubic root of 217060421 is about 600.9802688790.

The spelling of 217060421 in words is "two hundred seventeen million, sixty thousand, four hundred twenty-one".