121101210121 has 2 divisors, whose sum is σ = 121101210122. Its totient is φ = 121101210120.

The previous prime is 121101210107. The next prime is 121101210127. The reversal of 121101210121 is 121012101121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65846126025 + 55255084096 = 256605^2 + 235064^2 .

It is a cyclic number.

It is not a de Polignac number, because 121101210121 - 2⁷ = 121101209993 is a prime.

It is not a weakly prime, because it can be changed into another prime (121101210127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550605060 + 60550605061.

It is an arithmetic number, because the mean of its divisors is an integer number (60550605061).

Almost surely, 2^121101210121 is an apocalyptic number.

It is an amenable number.

121101210121 is a deficient number, since it is larger than the sum of its proper divisors (1).

121101210121 is an equidigital number, since it uses as much as digits as its factorization.

121101210121 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 121101210121 its reverse (121012101121), we get a palindrome (242113311242).

The spelling of 121101210121 in words is "one hundred twenty-one billion, one hundred one million, two hundred ten thousand, one hundred twenty-one".