20121221010211 has 2 divisors, whose sum is σ = 20121221010212. Its totient is φ = 20121221010210.

The previous prime is 20121221010193. The next prime is 20121221010239. The reversal of 20121221010211 is 11201012212102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20121221010211 - 2¹⁷ = 20121220879139 is a prime.

It is not a weakly prime, because it can be changed into another prime (20121221010811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060610505105 + 10060610505106.

It is an arithmetic number, because the mean of its divisors is an integer number (10060610505106).

Almost surely, 2^{20121221010211} is an apocalyptic number.

20121221010211 is a deficient number, since it is larger than the sum of its proper divisors (1).

20121221010211 is an equidigital number, since it uses as much as digits as its factorization.

20121221010211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20121221010211 its reverse (11201012212102), we get a palindrome (31322233222313).

The spelling of 20121221010211 in words is "twenty trillion, one hundred twenty-one billion, two hundred twenty-one million, ten thousand, two hundred eleven".