216769421 has 8 divisors (see below), whose sum is σ = 242867424. Its totient is φ = 191736720.

The previous prime is 216769393. The next prime is 216769433. The reversal of 216769421 is 124967612.

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 216769421 - 2¹⁴ = 216753037 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 (216769471) 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, 265895 + ... + 266708.

It is an arithmetic number, because the mean of its divisors is an integer number (30358428).

Almost surely, 2^216769421 is an apocalyptic number.

It is an amenable number.

216769421 is a deficient number, since it is larger than the sum of its proper divisors (26098003).

216769421 is a wasteful number, since it uses less digits than its factorization.

216769421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532651.

The product of its digits is 36288, while the sum is 38.

The square root of 216769421 is about 14723.0914213014. The cubic root of 216769421 is about 600.7115826019.

The spelling of 216769421 in words is "two hundred sixteen million, seven hundred sixty-nine thousand, four hundred twenty-one".