121211621411 has 2 divisors, whose sum is σ = 121211621412. Its totient is φ = 121211621410.

The previous prime is 121211621381. The next prime is 121211621413. The reversal of 121211621411 is 114126112121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121211621411 - 2⁶ = 121211621347 is a prime.

It is a Sophie Germain prime.

Together with 121211621413, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121211621413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60605810705 + 60605810706.

It is an arithmetic number, because the mean of its divisors is an integer number (60605810706).

Almost surely, 2^121211621411 is an apocalyptic number.

121211621411 is a deficient number, since it is larger than the sum of its proper divisors (1).

121211621411 is an equidigital number, since it uses as much as digits as its factorization.

121211621411 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 192, while the sum is 23.

Adding to 121211621411 its reverse (114126112121), we get a palindrome (235337733532).

The spelling of 121211621411 in words is "one hundred twenty-one billion, two hundred eleven million, six hundred twenty-one thousand, four hundred eleven".