20120000221 has 2 divisors, whose sum is σ = 20120000222. Its totient is φ = 20120000220.

The previous prime is 20120000207. The next prime is 20120000279. The reversal of 20120000221 is 12200002102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14355394596 + 5764605625 = 119814^2 + 75925^2 .

It is a cyclic number.

It is not a de Polignac number, because 20120000221 - 2⁵ = 20120000189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20120000198 and 20120000207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120000321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060000110 + 10060000111.

It is an arithmetic number, because the mean of its divisors is an integer number (10060000111).

Almost surely, 2^20120000221 is an apocalyptic number.

It is an amenable number.

20120000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120000221 is an equidigital number, since it uses as much as digits as its factorization.

20120000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20120000221 its reverse (12200002102), we get a palindrome (32320002323).

The spelling of 20120000221 in words is "twenty billion, one hundred twenty million, two hundred twenty-one", and thus it is an aban number.