216520023 has 8 divisors (see below), whose sum is σ = 294835968. Its totient is φ = 141275384.

The previous prime is 216519997. The next prime is 216520033. The reversal of 216520023 is 320025612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216520023 - 2⁸ = 216519767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216520033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 767661 + ... + 767942.

It is an arithmetic number, because the mean of its divisors is an integer number (36854496).

Almost surely, 2^216520023 is an apocalyptic number.

216520023 is a deficient number, since it is larger than the sum of its proper divisors (78315945).

216520023 is a wasteful number, since it uses less digits than its factorization.

216520023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1535653.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 216520023 is about 14714.6193630688. The cubic root of 216520023 is about 600.4811168856.

Adding to 216520023 its reverse (320025612), we get a palindrome (536545635).

The spelling of 216520023 in words is "two hundred sixteen million, five hundred twenty thousand, twenty-three".