20124333221 has 4 divisors (see below), whose sum is σ = 20247795552. Its totient is φ = 20000870892.

The previous prime is 20124333199. The next prime is 20124333239. The reversal of 20124333221 is 12233342102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12233342102 = 2 ⋅6116671051.

It is a cyclic number.

It is not a de Polignac number, because 20124333221 - 2⁶ = 20124333157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124335221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61730921 + ... + 61731246.

It is an arithmetic number, because the mean of its divisors is an integer number (5061948888).

Almost surely, 2^20124333221 is an apocalyptic number.

It is an amenable number.

20124333221 is a deficient number, since it is larger than the sum of its proper divisors (123462331).

20124333221 is a wasteful number, since it uses less digits than its factorization.

20124333221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123462330.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 20124333221 its reverse (12233342102), we get a palindrome (32357675323).

The spelling of 20124333221 in words is "twenty billion, one hundred twenty-four million, three hundred thirty-three thousand, two hundred twenty-one".