121100101021 has 2 divisors, whose sum is σ = 121100101022. Its totient is φ = 121100101020.

The previous prime is 121100101019. The next prime is 121100101061. The reversal of 121100101021 is 120101001121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120922412121 + 177688900 = 347739^2 + 13330^2 .

It is a cyclic number.

It is not a de Polignac number, because 121100101021 - 2¹ = 121100101019 is a prime.

Together with 121100101019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 121100100989 and 121100101007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121100101061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60550050510 + 60550050511.

It is an arithmetic number, because the mean of its divisors is an integer number (60550050511).

Almost surely, 2^121100101021 is an apocalyptic number.

It is an amenable number.

121100101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121100101021 is an equidigital number, since it uses as much as digits as its factorization.

121100101021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 121100101021 its reverse (120101001121), we get a palindrome (241201102142).

The spelling of 121100101021 in words is "one hundred twenty-one billion, one hundred million, one hundred one thousand, twenty-one".