121221111097 has 2 divisors, whose sum is σ = 121221111098. Its totient is φ = 121221111096.

The previous prime is 121221111091. The next prime is 121221111127. The reversal of 121221111097 is 790111122121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119331557136 + 1889553961 = 345444^2 + 43469^2 .

It is an emirp because it is prime and its reverse (790111122121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221111097 is a prime.

It is not a weakly prime, because it can be changed into another prime (121221111091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60610555548 + 60610555549.

It is an arithmetic number, because the mean of its divisors is an integer number (60610555549).

Almost surely, 2^121221111097 is an apocalyptic number.

It is an amenable number.

121221111097 is a deficient number, since it is larger than the sum of its proper divisors (1).

121221111097 is an equidigital number, since it uses as much as digits as its factorization.

121221111097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 28.

The spelling of 121221111097 in words is "one hundred twenty-one billion, two hundred twenty-one million, one hundred eleven thousand, ninety-seven".