216151521233 has 4 divisors (see below), whose sum is σ = 219195908928. Its totient is φ = 213107133540.

The previous prime is 216151521203. The next prime is 216151521253. The reversal of 216151521233 is 332125151612.

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 a de Polignac number, because none of the positive numbers 2^k-216151521233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 216151521233.

It is not an unprimeable number, because it can be changed into a prime (216151521203) 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, 1522193741 + ... + 1522193882.

It is an arithmetic number, because the mean of its divisors is an integer number (54798977232).

Almost surely, 2^216151521233 is an apocalyptic number.

It is an amenable number.

216151521233 is a deficient number, since it is larger than the sum of its proper divisors (3044387695).

216151521233 is an equidigital number, since it uses as much as digits as its factorization.

216151521233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044387694.

The product of its digits is 10800, while the sum is 32.

Adding to 216151521233 its reverse (332125151612), we get a palindrome (548276672845).

The spelling of 216151521233 in words is "two hundred sixteen billion, one hundred fifty-one million, five hundred twenty-one thousand, two hundred thirty-three".