121221102011 has 2 divisors, whose sum is σ = 121221102012. Its totient is φ = 121221102010.

The previous prime is 121221101983. The next prime is 121221102017. The reversal of 121221102011 is 110201122121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121221102011 - 2¹⁸ = 121220839867 is a prime.

It is a super-2 number, since 2×121221102011² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (121221102017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610551005 + 60610551006.

It is an arithmetic number, because the mean of its divisors is an integer number (60610551006).

Almost surely, 2^121221102011 is an apocalyptic number.

121221102011 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221102011 is an equidigital number, since it uses as much as digits as its factorization.

121221102011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121221102011 its reverse (110201122121), we get a palindrome (231422224132).

The spelling of 121221102011 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, eleven".