121021010111021 has 2 divisors, whose sum is σ = 121021010111022. Its totient is φ = 121021010111020.

The previous prime is 121021010111017. The next prime is 121021010111041. The reversal of 121021010111021 is 120111010120121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70230601336900 + 50790408774121 = 8380370^2 + 7126739^2 .

It is an emirp because it is prime and its reverse (120111010120121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 121021010111021 - 2² = 121021010111017 is a prime.

It is a super-2 number, since 2×121021010111021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121021010110987 and 121021010111005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121021010111041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510505055510 + 60510505055511.

It is an arithmetic number, because the mean of its divisors is an integer number (60510505055511).

Almost surely, 2^{121021010111021} is an apocalyptic number.

It is an amenable number.

121021010111021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121021010111021 is an equidigital number, since it uses as much as digits as its factorization.

121021010111021 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 14.

Adding to 121021010111021 its reverse (120111010120121), we get a palindrome (241132020231142).

The spelling of 121021010111021 in words is "one hundred twenty-one trillion, twenty-one billion, ten million, one hundred eleven thousand, twenty-one".