20012232221 has 8 divisors (see below), whose sum is σ = 20046115320. Its totient is φ = 19978371072.

The previous prime is 20012232199. The next prime is 20012232263. The reversal of 20012232221 is 12223221002.

It can be written as a sum of positive squares in 4 ways, for example, as 8484988996 + 11527243225 = 92114^2 + 107365^2 .

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 20012232221 - 2⁶ = 20012232157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012232221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012237221) 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 7 ways as a sum of consecutive naturals, for example, 3821621 + ... + 3826853.

It is an arithmetic number, because the mean of its divisors is an integer number (2505764415).

Almost surely, 2^20012232221 is an apocalyptic number.

It is an amenable number.

20012232221 is a deficient number, since it is larger than the sum of its proper divisors (33883099).

20012232221 is an equidigital number, since it uses as much as digits as its factorization.

20012232221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10975.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 20012232221 its reverse (12223221002), we get a palindrome (32235453223).

The spelling of 20012232221 in words is "twenty billion, twelve million, two hundred thirty-two thousand, two hundred twenty-one".