121211621413 has 2 divisors, whose sum is σ = 121211621414. Its totient is φ = 121211621412.

The previous prime is 121211621411. The next prime is 121211621441. The reversal of 121211621413 is 314126112121.

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., 112172746084 + 9038875329 = 334922^2 + 95073^2 .

It is a cyclic number.

It is not a de Polignac number, because 121211621413 - 2¹ = 121211621411 is a prime.

Together with 121211621411, 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 (121211621411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605810706 + 60605810707.

It is an arithmetic number, because the mean of its divisors is an integer number (60605810707).

Almost surely, 2^121211621413 is an apocalyptic number.

It is an amenable number.

121211621413 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211621413 is an equidigital number, since it uses as much as digits as its factorization.

121211621413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

Adding to 121211621413 its reverse (314126112121), we get a palindrome (435337733534).

The spelling of 121211621413 in words is "one hundred twenty-one billion, two hundred eleven million, six hundred twenty-one thousand, four hundred thirteen".