216233251 has 16 divisors (see below), whose sum is σ = 255074400. Its totient is φ = 181375488.

The previous prime is 216233231. The next prime is 216233257. The reversal of 216233251 is 152332612.

It is a cyclic number.

It is not a de Polignac number, because 216233251 - 2¹⁹ = 215708963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216233257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10461 + ... + 23278.

It is an arithmetic number, because the mean of its divisors is an integer number (15942150).

Almost surely, 2^216233251 is an apocalyptic number.

216233251 is a deficient number, since it is larger than the sum of its proper divisors (38841149).

216233251 is a wasteful number, since it uses less digits than its factorization.

216233251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33798.

The product of its digits is 2160, while the sum is 25.

The square root of 216233251 is about 14704.8716757407. The cubic root of 216233251 is about 600.2158954541.

Adding to 216233251 its reverse (152332612), we get a palindrome (368565863).

The spelling of 216233251 in words is "two hundred sixteen million, two hundred thirty-three thousand, two hundred fifty-one".