216142253 has 4 divisors (see below), whose sum is σ = 216754908. Its totient is φ = 215529600.

The previous prime is 216142229. The next prime is 216142259. The reversal of 216142253 is 352241612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 149768644 + 66373609 = 12238^2 + 8147^2 .

It is a cyclic number.

It is not a de Polignac number, because 216142253 - 2¹² = 216138157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216142259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 305798 + ... + 306503.

It is an arithmetic number, because the mean of its divisors is an integer number (54188727).

Almost surely, 2^216142253 is an apocalyptic number.

It is an amenable number.

216142253 is a deficient number, since it is larger than the sum of its proper divisors (612655).

216142253 is an equidigital number, since it uses as much as digits as its factorization.

216142253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612654.

The product of its digits is 2880, while the sum is 26.

The square root of 216142253 is about 14701.7772054946. Note that the first 3 decimals coincide. The cubic root of 216142253 is about 600.1316868363.

Adding to 216142253 its reverse (352241612), we get a palindrome (568383865).

The spelling of 216142253 in words is "two hundred sixteen million, one hundred forty-two thousand, two hundred fifty-three".