122011212220021 has 2 divisors, whose sum is σ = 122011212220022. Its totient is φ = 122011212220020.

The previous prime is 122011212220019. The next prime is 122011212220033. The reversal of 122011212220021 is 120022212110221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63691093648900 + 58320118571121 = 7980670^2 + 7636761^2 .

It is a cyclic number.

It is not a de Polignac number, because 122011212220021 - 2¹ = 122011212220019 is a prime.

Together with 122011212220019, 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 (122011212220061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61005606110010 + 61005606110011.

It is an arithmetic number, because the mean of its divisors is an integer number (61005606110011).

Almost surely, 2^{122011212220021} is an apocalyptic number.

It is an amenable number.

122011212220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

122011212220021 is an equidigital number, since it uses as much as digits as its factorization.

122011212220021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 122011212220021 its reverse (120022212110221), we get a palindrome (242033424330242).

The spelling of 122011212220021 in words is "one hundred twenty-two trillion, eleven billion, two hundred twelve million, two hundred twenty thousand, twenty-one".