1821268216 has 64 divisors (see below), whose sum is σ = 3580083360. Its totient is φ = 867840000.

The previous prime is 1821268213. The next prime is 1821268219. The reversal of 1821268216 is 6128621281.

It is an interprime number because it is at equal distance from previous prime (1821268213) and next prime (1821268219).

It is a super-2 number, since 2×1821268216² = 6634035829223645312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821268213) 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, 4541616 + ... + 4542016.

Almost surely, 2^1821268216 is an apocalyptic number.

It is an amenable number.

1821268216 is a deficient number, since it is larger than the sum of its proper divisors (1758815144).

1821268216 is a wasteful number, since it uses less digits than its factorization.

1821268216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736 (or 732 counting only the distinct ones).

The product of its digits is 18432, while the sum is 37.

The square root of 1821268216 is about 42676.3191477428. The cubic root of 1821268216 is about 1221.2126739901.

Adding to 1821268216 its reverse (6128621281), we get a palindrome (7949889497).

The spelling of 1821268216 in words is "one billion, eight hundred twenty-one million, two hundred sixty-eight thousand, two hundred sixteen".