121222021853 has 2 divisors, whose sum is σ = 121222021854. Its totient is φ = 121222021852.

The previous prime is 121222021849. The next prime is 121222021859. The reversal of 121222021853 is 358120222121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86640156409 + 34581865444 = 294347^2 + 185962^2 .

It is an emirp because it is prime and its reverse (358120222121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121222021853 - 2² = 121222021849 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121222021859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60611010926 + 60611010927.

It is an arithmetic number, because the mean of its divisors is an integer number (60611010927).

Almost surely, 2^121222021853 is an apocalyptic number.

It is an amenable number.

121222021853 is a deficient number, since it is larger than the sum of its proper divisors (1).

121222021853 is an equidigital number, since it uses as much as digits as its factorization.

121222021853 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3840, while the sum is 29.

Adding to 121222021853 its reverse (358120222121), we get a palindrome (479342243974).

The spelling of 121222021853 in words is "one hundred twenty-one billion, two hundred twenty-two million, twenty-one thousand, eight hundred fifty-three".