122011211210221 has 2 divisors, whose sum is σ = 122011211210222. Its totient is φ = 122011211210220.

The previous prime is 122011211210219. The next prime is 122011211210267. The reversal of 122011211210221 is 122012112110221.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84231921062025 + 37779290148196 = 9177795^2 + 6146486^2 .

It is an emirp because it is prime and its reverse (122012112110221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 122011211210221 - 2¹ = 122011211210219 is a prime.

Together with 122011211210219, 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 (122011211210201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61005605605110 + 61005605605111.

It is an arithmetic number, because the mean of its divisors is an integer number (61005605605111).

Almost surely, 2^{122011211210221} is an apocalyptic number.

It is an amenable number.

122011211210221 is a deficient number, since it is larger than the sum of its proper divisors (1).

122011211210221 is an equidigital number, since it uses as much as digits as its factorization.

122011211210221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 122011211210221 its reverse (122012112110221), we get a palindrome (244023323320442).

The spelling of 122011211210221 in words is "one hundred twenty-two trillion, eleven billion, two hundred eleven million, two hundred ten thousand, two hundred twenty-one".