216420501 has 16 divisors (see below), whose sum is σ = 328481280. Its totient is φ = 125460720.

The previous prime is 216420493. The next prime is 216420521. The reversal of 216420501 is 105024612.

It is not a de Polignac number, because 216420501 - 2³ = 216420493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216420521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 141811 + ... + 143328.

It is an arithmetic number, because the mean of its divisors is an integer number (20530080).

Almost surely, 2^216420501 is an apocalyptic number.

It is an amenable number.

216420501 is a deficient number, since it is larger than the sum of its proper divisors (112060779).

216420501 is a wasteful number, since it uses less digits than its factorization.

216420501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285176.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 216420501 is about 14711.2372355285. The cubic root of 216420501 is about 600.3891003914.

The spelling of 216420501 in words is "two hundred sixteen million, four hundred twenty thousand, five hundred one".