216621063 has 12 divisors (see below), whose sum is σ = 315996408. Its totient is φ = 142983600.

The previous prime is 216621029. The next prime is 216621101. The reversal of 216621063 is 360126612.

It is not a de Polignac number, because 216621063 - 2¹⁶ = 216555527 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216621563) 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, 118245 + ... + 120062.

It is an arithmetic number, because the mean of its divisors is an integer number (26333034).

Almost surely, 2^216621063 is an apocalyptic number.

216621063 is a deficient number, since it is larger than the sum of its proper divisors (99375345).

216621063 is a wasteful number, since it uses less digits than its factorization.

216621063 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238414 (or 238411 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 216621063 is about 14718.0522828260. The cubic root of 216621063 is about 600.5745080586.

Adding to 216621063 its reverse (360126612), we get a palindrome (576747675).

The spelling of 216621063 in words is "two hundred sixteen million, six hundred twenty-one thousand, sixty-three".