121221111021011 has 2 divisors, whose sum is σ = 121221111021012. Its totient is φ = 121221111021010.

The previous prime is 121221111020957. The next prime is 121221111021013. The reversal of 121221111021011 is 110120111122121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221111021011 is a prime.

Together with 121221111021013, 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 (121221111021013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610555510505 + 60610555510506.

It is an arithmetic number, because the mean of its divisors is an integer number (60610555510506).

Almost surely, 2^{121221111021011} is an apocalyptic number.

121221111021011 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221111021011 is an equidigital number, since it uses as much as digits as its factorization.

121221111021011 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 17.

Adding to 121221111021011 its reverse (110120111122121), we get a palindrome (231341222143132).

The spelling of 121221111021011 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, one hundred eleven million, twenty-one thousand, eleven".