20303243221 has 8 divisors (see below), whose sum is σ = 20787181184. Its totient is φ = 19819840320.

The previous prime is 20303243209. The next prime is 20303243249. The reversal of 20303243221 is 12234230302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20303243221 - 2¹¹ = 20303241173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20303243192 and 20303243201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20303246221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56445 + ... + 209266.

It is an arithmetic number, because the mean of its divisors is an integer number (2598397648).

Almost surely, 2^20303243221 is an apocalyptic number.

It is an amenable number.

20303243221 is a deficient number, since it is larger than the sum of its proper divisors (483937963).

20303243221 is a wasteful number, since it uses less digits than its factorization.

20303243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267531.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 20303243221 its reverse (12234230302), we get a palindrome (32537473523).

The spelling of 20303243221 in words is "twenty billion, three hundred three million, two hundred forty-three thousand, two hundred twenty-one".