216021382 has 24 divisors (see below), whose sum is σ = 340824960. Its totient is φ = 102677520.

The previous prime is 216021371. The next prime is 216021383. The reversal of 216021382 is 283120612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216021383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 201544 + ... + 202612.

It is an arithmetic number, because the mean of its divisors is an integer number (14201040).

Almost surely, 2^216021382 is an apocalyptic number.

216021382 is a deficient number, since it is larger than the sum of its proper divisors (124803578).

216021382 is a wasteful number, since it uses less digits than its factorization.

216021382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308 (or 1285 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 216021382 is about 14697.6658691100. The cubic root of 216021382 is about 600.0197974949.

Adding to 216021382 its reverse (283120612), we get a palindrome (499141994).

The spelling of 216021382 in words is "two hundred sixteen million, twenty-one thousand, three hundred eighty-two".