121201000210021 has 2 divisors, whose sum is σ = 121201000210022. Its totient is φ = 121201000210020.

The previous prime is 121201000209953. The next prime is 121201000210027. The reversal of 121201000210021 is 120012000102121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70019424153121 + 51181576056900 = 8367761^2 + 7154130^2 .

It is a cyclic number.

It is not a de Polignac number, because 121201000210021 - 2⁴⁵ = 86016628121189 is a prime.

It is a super-2 number, since 2×121201000210021² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121201000209983 and 121201000210010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121201000210027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60600500105010 + 60600500105011.

It is an arithmetic number, because the mean of its divisors is an integer number (60600500105011).

Almost surely, 2^{121201000210021} is an apocalyptic number.

It is an amenable number.

121201000210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121201000210021 is an equidigital number, since it uses as much as digits as its factorization.

121201000210021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121201000210021 its reverse (120012000102121), we get a palindrome (241213000312142).

The spelling of 121201000210021 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred ten thousand, twenty-one".