33123220221 has 64 divisors (see below), whose sum is σ = 55722985472. Its totient is φ = 17033732352.

The previous prime is 33123220219. The next prime is 33123220243. The reversal of 33123220221 is 12202232133.

It is a happy number.

It is not a de Polignac number, because 33123220221 - 2¹ = 33123220219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33123221221) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7193706 + ... + 7198308.

It is an arithmetic number, because the mean of its divisors is an integer number (870671648).

Almost surely, 2^33123220221 is an apocalyptic number.

It is an amenable number.

33123220221 is a deficient number, since it is larger than the sum of its proper divisors (22599765251).

33123220221 is a wasteful number, since it uses less digits than its factorization.

33123220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5282.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 33123220221 its reverse (12202232133), we get a palindrome (45325452354).

The spelling of 33123220221 in words is "thirty-three billion, one hundred twenty-three million, two hundred twenty thousand, two hundred twenty-one".