33012123221 has 16 divisors (see below), whose sum is σ = 41342558208. Its totient is φ = 25608366000.

The previous prime is 33012123191. The next prime is 33012123223. The reversal of 33012123221 is 12232121033.

It is a de Polignac number, because none of the positive numbers 2^k-33012123221 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 33012123193 and 33012123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33012123223) 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, 944105 + ... + 978446.

It is an arithmetic number, because the mean of its divisors is an integer number (2583909888).

Almost surely, 2^33012123221 is an apocalyptic number.

It is an amenable number.

33012123221 is a deficient number, since it is larger than the sum of its proper divisors (8330434987).

33012123221 is a wasteful number, since it uses less digits than its factorization.

33012123221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922792.

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

Adding to 33012123221 its reverse (12232121033), we get a palindrome (45244244254).

The spelling of 33012123221 in words is "thirty-three billion, twelve million, one hundred twenty-three thousand, two hundred twenty-one".