216121983 has 16 divisors (see below), whose sum is σ = 359268096. Its totient is φ = 112271040.

The previous prime is 216121981. The next prime is 216122033. The reversal of 216121983 is 389121612.

It is not a de Polignac number, because 216121983 - 2¹ = 216121981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216121981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 467566 + ... + 468027.

It is an arithmetic number, because the mean of its divisors is an integer number (22454256).

Almost surely, 2^216121983 is an apocalyptic number.

216121983 is a deficient number, since it is larger than the sum of its proper divisors (143146113).

216121983 is a wasteful number, since it uses less digits than its factorization.

216121983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935614.

The product of its digits is 5184, while the sum is 33.

The square root of 216121983 is about 14701.0878168930. The cubic root of 216121983 is about 600.1129259671.

The spelling of 216121983 in words is "two hundred sixteen million, one hundred twenty-one thousand, nine hundred eighty-three".