121212404011 has 2 divisors, whose sum is σ = 121212404012. Its totient is φ = 121212404010.

The previous prime is 121212403999. The next prime is 121212404017. The reversal of 121212404011 is 110404212121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121212404011 - 2¹⁵ = 121212371243 is a prime.

It is a super-2 number, since 2×121212404011² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 121212404011.

It is not a weakly prime, because it can be changed into another prime (121212404017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60606202005 + 60606202006.

It is an arithmetic number, because the mean of its divisors is an integer number (60606202006).

Almost surely, 2^121212404011 is an apocalyptic number.

121212404011 is a deficient number, since it is larger than the sum of its proper divisors (1).

121212404011 is an equidigital number, since it uses as much as digits as its factorization.

121212404011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 121212404011 its reverse (110404212121), we get a palindrome (231616616132).

The spelling of 121212404011 in words is "one hundred twenty-one billion, two hundred twelve million, four hundred four thousand, eleven".