20124330221 has 4 divisors (see below), whose sum is σ = 20124632700. Its totient is φ = 20124027744.

The previous prime is 20124330173. The next prime is 20124330223. The reversal of 20124330221 is 12203342102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5683501321 + 14440828900 = 75389^2 + 120170^2 .

It is a cyclic number.

It is not a de Polignac number, because 20124330221 - 2³⁰ = 19050588397 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20124330193 and 20124330202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20124330223) 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, 3026 + ... + 200643.

It is an arithmetic number, because the mean of its divisors is an integer number (5031158175).

Almost surely, 2^20124330221 is an apocalyptic number.

It is an amenable number.

20124330221 is a deficient number, since it is larger than the sum of its proper divisors (302479).

20124330221 is an equidigital number, since it uses as much as digits as its factorization.

20124330221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302478.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 20124330221 its reverse (12203342102), we get a palindrome (32327672323).

The spelling of 20124330221 in words is "twenty billion, one hundred twenty-four million, three hundred thirty thousand, two hundred twenty-one".