121221101011 has 2 divisors, whose sum is σ = 121221101012. Its totient is φ = 121221101010.

The previous prime is 121221101003. The next prime is 121221101041. The reversal of 121221101011 is 110101122121.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (110101122121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121221101011 - 2³ = 121221101003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121221100982 and 121221101000.

It is not a weakly prime, because it can be changed into another prime (121221101041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610550505 + 60610550506.

It is an arithmetic number, because the mean of its divisors is an integer number (60610550506).

Almost surely, 2^121221101011 is an apocalyptic number.

121221101011 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221101011 is an equidigital number, since it uses as much as digits as its factorization.

121221101011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 121221101011 its reverse (110101122121), we get a palindrome (231322223132).

The spelling of 121221101011 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred one thousand, eleven".