121102021 has 2 divisors, whose sum is σ = 121102022. Its totient is φ = 121102020.

The previous prime is 121102013. The next prime is 121102039. The reversal of 121102021 is 120201121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88096996 + 33005025 = 9386^2 + 5745^2 .

It is a cyclic number.

It is not a de Polignac number, because 121102021 - 2³ = 121102013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121101989 and 121102007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121102001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60551010 + 60551011.

It is an arithmetic number, because the mean of its divisors is an integer number (60551011).

Almost surely, 2^121102021 is an apocalyptic number.

It is an amenable number.

121102021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121102021 is an equidigital number, since it uses as much as digits as its factorization.

121102021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 121102021 is about 11004.6363411064. The cubic root of 121102021 is about 494.7477148578.

Adding to 121102021 its reverse (120201121), we get a palindrome (241303142).

The spelling of 121102021 in words is "one hundred twenty-one million, one hundred two thousand, twenty-one".