20241213221 has 4 divisors (see below), whose sum is σ = 20386833600. Its totient is φ = 20095592844.

The previous prime is 20241213211. The next prime is 20241213299. The reversal of 20241213221 is 12231214202.

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: 12231214202 = 2 ⋅6115607101.

It is a cyclic number.

It is not a de Polignac number, because 20241213221 - 2³⁰ = 19167471397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20241213193 and 20241213202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20241213211) 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, 72809981 + ... + 72810258.

It is an arithmetic number, because the mean of its divisors is an integer number (5096708400).

Almost surely, 2^20241213221 is an apocalyptic number.

It is an amenable number.

20241213221 is a deficient number, since it is larger than the sum of its proper divisors (145620379).

20241213221 is a wasteful number, since it uses less digits than its factorization.

20241213221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145620378.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 20241213221 its reverse (12231214202), we get a palindrome (32472427423).

The spelling of 20241213221 in words is "twenty billion, two hundred forty-one million, two hundred thirteen thousand, two hundred twenty-one".