21222120001211 has 2 divisors, whose sum is σ = 21222120001212. Its totient is φ = 21222120001210.

The previous prime is 21222120001183. The next prime is 21222120001219. The reversal of 21222120001211 is 11210002122212.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21222120001211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222120001211.

It is not a weakly prime, because it can be changed into another prime (21222120001219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611060000605 + 10611060000606.

It is an arithmetic number, because the mean of its divisors is an integer number (10611060000606).

Almost surely, 2^{21222120001211} is an apocalyptic number.

21222120001211 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222120001211 is an equidigital number, since it uses as much as digits as its factorization.

21222120001211 is an evil number, because the sum of its binary digits is even.

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

Adding to 21222120001211 its reverse (11210002122212), we get a palindrome (32432122123423).

The spelling of 21222120001211 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, one thousand, two hundred eleven".