121021111221121 has 2 divisors, whose sum is σ = 121021111221122. Its totient is φ = 121021111221120.

The previous prime is 121021111221119. The next prime is 121021111221133. The reversal of 121021111221121 is 121122111120121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95893839651600 + 25127271569521 = 9792540^2 + 5012711^2 .

It is an emirp because it is prime and its reverse (121122111120121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121021111221121 - 2¹ = 121021111221119 is a prime.

It is a super-3 number, since 3×121021111221121³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 121021111221119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (121021111225121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510555610560 + 60510555610561.

It is an arithmetic number, because the mean of its divisors is an integer number (60510555610561).

Almost surely, 2^{121021111221121} is an apocalyptic number.

It is an amenable number.

121021111221121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021111221121 is an equidigital number, since it uses as much as digits as its factorization.

121021111221121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 19.

Adding to 121021111221121 its reverse (121122111120121), we get a palindrome (242143222341242).

The spelling of 121021111221121 in words is "one hundred twenty-one trillion, twenty-one billion, one hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".