216231033 has 4 divisors (see below), whose sum is σ = 288308048. Its totient is φ = 144154020.

The previous prime is 216231011. The next prime is 216231079. The reversal of 216231033 is 330132612.

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 not a de Polignac number, because 216231033 - 2⁶ = 216230969 is a prime.

It is a super-4 number, since 4×216231033⁴ (a number of 34 digits) contains 4444 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (216231083) 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, 36038503 + ... + 36038508.

It is an arithmetic number, because the mean of its divisors is an integer number (72077012).

Almost surely, 2^216231033 is an apocalyptic number.

It is an amenable number.

216231033 is a deficient number, since it is larger than the sum of its proper divisors (72077015).

216231033 is an equidigital number, since it uses as much as digits as its factorization.

216231033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72077014.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 216231033 is about 14704.7962583641. The cubic root of 216231033 is about 600.2138432205.

Adding to 216231033 its reverse (330132612), we get a palindrome (546363645).

The spelling of 216231033 in words is "two hundred sixteen million, two hundred thirty-one thousand, thirty-three".