216630253 has 4 divisors (see below), whose sum is σ = 247577440. Its totient is φ = 185683068.

The previous prime is 216630251. The next prime is 216630283. The reversal of 216630253 is 352036612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 216630253 - 2¹ = 216630251 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 (216630251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15473583 + ... + 15473596.

It is an arithmetic number, because the mean of its divisors is an integer number (61894360).

Almost surely, 2^216630253 is an apocalyptic number.

It is an amenable number.

216630253 is a deficient number, since it is larger than the sum of its proper divisors (30947187).

216630253 is an equidigital number, since it uses as much as digits as its factorization.

216630253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30947186.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 216630253 is about 14718.3644811508. The cubic root of 216630253 is about 600.5830009256.

Adding to 216630253 its reverse (352036612), we get a palindrome (568666865).

The spelling of 216630253 in words is "two hundred sixteen million, six hundred thirty thousand, two hundred fifty-three".