216021276 has 48 divisors (see below), whose sum is σ = 560851200. Its totient is φ = 71904816.

The previous prime is 216021229. The next prime is 216021287. The reversal of 216021276 is 672120612.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137785 + ... + 139343.

It is an arithmetic number, because the mean of its divisors is an integer number (11684400).

Almost surely, 2^216021276 is an apocalyptic number.

It is an amenable number.

216021276 is an abundant number, since it is smaller than the sum of its proper divisors (344829924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216021276 is a wasteful number, since it uses less digits than its factorization.

216021276 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2855 (or 2847 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 216021276 is about 14697.6622630948. The cubic root of 216021276 is about 600.0196993532.

Adding to 216021276 its reverse (672120612), we get a palindrome (888141888).

It can be divided in two parts, 2160 and 21276, that added together give a triangular number (23436 = T₂₁₆).

The spelling of 216021276 in words is "two hundred sixteen million, twenty-one thousand, two hundred seventy-six".