20120221222111 has 2 divisors, whose sum is σ = 20120221222112. Its totient is φ = 20120221222110.

The previous prime is 20120221222109. The next prime is 20120221222201. The reversal of 20120221222111 is 11122212202102.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20120221222111 - 2¹ = 20120221222109 is a prime.

Together with 20120221222109, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20120221222411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10060110611055 + 10060110611056.

It is an arithmetic number, because the mean of its divisors is an integer number (10060110611056).

Almost surely, 2^{20120221222111} is an apocalyptic number.

20120221222111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20120221222111 is an equidigital number, since it uses as much as digits as its factorization.

20120221222111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 20120221222111 its reverse (11122212202102), we get a palindrome (31242433424213).

The spelling of 20120221222111 in words is "twenty trillion, one hundred twenty billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".