33212120231 has 4 divisors (see below), whose sum is σ = 33244650264. Its totient is φ = 33179590200.

The previous prime is 33212120191. The next prime is 33212120243. The reversal of 33212120231 is 13202121233.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33212120231 is a prime.

It is a super-2 number, since 2×33212120231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33212120131) 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, 16263485 + ... + 16265526.

It is an arithmetic number, because the mean of its divisors is an integer number (8311162566).

Almost surely, 2^33212120231 is an apocalyptic number.

33212120231 is a deficient number, since it is larger than the sum of its proper divisors (32530033).

33212120231 is a wasteful number, since it uses less digits than its factorization.

33212120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32530032.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 33212120231 its reverse (13202121233), we get a palindrome (46414241464).

It can be divided in two parts, 332121202 and 31, that added together give a palindrome (332121233).

The spelling of 33212120231 in words is "thirty-three billion, two hundred twelve million, one hundred twenty thousand, two hundred thirty-one".