20124403221 has 12 divisors (see below), whose sum is σ = 29055352128. Its totient is φ = 12384247824.

The previous prime is 20124403171. The next prime is 20124403237. The reversal of 20124403221 is 12230442102.

It is not a de Polignac number, because 20124403221 - 2⁷ = 20124403093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124403291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19846045 + ... + 19847058.

It is an arithmetic number, because the mean of its divisors is an integer number (2421279344).

Almost surely, 2^20124403221 is an apocalyptic number.

It is an amenable number.

20124403221 is a deficient number, since it is larger than the sum of its proper divisors (8930948907).

20124403221 is a wasteful number, since it uses less digits than its factorization.

20124403221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39693132 (or 39693119 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 20124403221 its reverse (12230442102), we get a palindrome (32354845323).

The spelling of 20124403221 in words is "twenty billion, one hundred twenty-four million, four hundred three thousand, two hundred twenty-one".