21112212000221 has 2 divisors, whose sum is σ = 21112212000222. Its totient is φ = 21112212000220.

The previous prime is 21112212000181. The next prime is 21112212000233. The reversal of 21112212000221 is 12200021221112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15438526197721 + 5673685802500 = 3929189^2 + 2381950^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112212000221 - 2²² = 21112207805917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21112212000221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112212800221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556106000110 + 10556106000111.

It is an arithmetic number, because the mean of its divisors is an integer number (10556106000111).

Almost surely, 2^{21112212000221} is an apocalyptic number.

It is an amenable number.

21112212000221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112212000221 is an equidigital number, since it uses as much as digits as its factorization.

21112212000221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21112212000221 its reverse (12200021221112), we get a palindrome (33312233221333).

The spelling of 21112212000221 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, two hundred twenty-one", and thus it is an aban number.