20330112221 has 4 divisors (see below), whose sum is σ = 20330399292. Its totient is φ = 20329825152.

The previous prime is 20330112211. The next prime is 20330112227. The reversal of 20330112221 is 12221103302.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1355049721 + 18975062500 = 36811^2 + 137750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20330112221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20330112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20330112227) 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, 47021 + ... + 207053.

It is an arithmetic number, because the mean of its divisors is an integer number (5082599823).

Almost surely, 2^20330112221 is an apocalyptic number.

It is an amenable number.

20330112221 is a deficient number, since it is larger than the sum of its proper divisors (287071).

20330112221 is a wasteful number, since it uses less digits than its factorization.

20330112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287070.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20330112221 its reverse (12221103302), we get a palindrome (32551215523).

The spelling of 20330112221 in words is "twenty billion, three hundred thirty million, one hundred twelve thousand, two hundred twenty-one".