121121020213 has 2 divisors, whose sum is σ = 121121020214. Its totient is φ = 121121020212.

The previous prime is 121121020211. The next prime is 121121020243. The reversal of 121121020213 is 312020121121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87614816004 + 33506204209 = 295998^2 + 183047^2 .

It is an emirp because it is prime and its reverse (312020121121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121121020213 - 2¹ = 121121020211 is a prime.

Together with 121121020211, 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 (121121020211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60560510106 + 60560510107.

It is an arithmetic number, because the mean of its divisors is an integer number (60560510107).

Almost surely, 2^121121020213 is an apocalyptic number.

It is an amenable number.

121121020213 is a deficient number, since it is larger than the sum of its proper divisors (1).

121121020213 is an equidigital number, since it uses as much as digits as its factorization.

121121020213 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 121121020213 its reverse (312020121121), we get a palindrome (433141141334).

The spelling of 121121020213 in words is "one hundred twenty-one billion, one hundred twenty-one million, twenty thousand, two hundred thirteen".