20122002122221 has 2 divisors, whose sum is σ = 20122002122222. Its totient is φ = 20122002122220.

The previous prime is 20122002122197. The next prime is 20122002122227. The reversal of 20122002122221 is 12222120022102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14404977661321 + 5717024460900 = 3795389^2 + 2391030^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122002122221 - 2²³ = 20121993733613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122002122227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061001061110 + 10061001061111.

It is an arithmetic number, because the mean of its divisors is an integer number (10061001061111).

Almost surely, 2^{20122002122221} is an apocalyptic number.

It is an amenable number.

20122002122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122002122221 is an equidigital number, since it uses as much as digits as its factorization.

20122002122221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 20122002122221 its reverse (12222120022102), we get a palindrome (32344122144323).

The spelling of 20122002122221 in words is "twenty trillion, one hundred twenty-two billion, two million, one hundred twenty-two thousand, two hundred twenty-one".