216215253 has 6 divisors (see below), whose sum is σ = 312310934. Its totient is φ = 144143496.

The previous prime is 216215243. The next prime is 216215257. The reversal of 216215253 is 352512612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 216001809 + 213444 = 14697^2 + 462^2 .

It is not a de Polignac number, because 216215253 - 2⁶ = 216215189 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216215257) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12011950 + ... + 12011967.

Almost surely, 2^216215253 is an apocalyptic number.

It is an amenable number.

216215253 is a deficient number, since it is larger than the sum of its proper divisors (96095681).

216215253 is a wasteful number, since it uses less digits than its factorization.

216215253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24023923 (or 24023920 counting only the distinct ones).

The product of its digits is 3600, while the sum is 27.

The square root of 216215253 is about 14704.2596889473. The cubic root of 216215253 is about 600.1992421636.

Adding to 216215253 its reverse (352512612), we get a palindrome (568727865).

The spelling of 216215253 in words is "two hundred sixteen million, two hundred fifteen thousand, two hundred fifty-three".