121211322013 has 2 divisors, whose sum is σ = 121211322014. Its totient is φ = 121211322012.

The previous prime is 121211321983. The next prime is 121211322031. The reversal of 121211322013 is 310223112121.

Together with next prime (121211322031) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78021338329 + 43189983684 = 279323^2 + 207822^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211322013 - 2⁵ = 121211321981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121211322313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605661006 + 60605661007.

It is an arithmetic number, because the mean of its divisors is an integer number (60605661007).

Almost surely, 2^121211322013 is an apocalyptic number.

It is an amenable number.

121211322013 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211322013 is an equidigital number, since it uses as much as digits as its factorization.

121211322013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 121211322013 its reverse (310223112121), we get a palindrome (431434434134).

It can be divided in two parts, 1212 and 11322013, that added together give a square (11323225 = 3365²).

The spelling of 121211322013 in words is "one hundred twenty-one billion, two hundred eleven million, three hundred twenty-two thousand, thirteen".