121020002021 has 2 divisors, whose sum is σ = 121020002022. Its totient is φ = 121020002020.

The previous prime is 121020002009. The next prime is 121020002137. The reversal of 121020002021 is 120200020121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78517644100 + 42502357921 = 280210^2 + 206161^2 .

It is a cyclic number.

It is not a de Polignac number, because 121020002021 - 2⁶ = 121020001957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121020001993 and 121020002011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121020002321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60510001010 + 60510001011.

It is an arithmetic number, because the mean of its divisors is an integer number (60510001011).

Almost surely, 2^121020002021 is an apocalyptic number.

It is an amenable number.

121020002021 is a deficient number, since it is larger than the sum of its proper divisors (1).

121020002021 is an equidigital number, since it uses as much as digits as its factorization.

121020002021 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 11.

Adding to 121020002021 its reverse (120200020121), we get a palindrome (241220022142).

The spelling of 121020002021 in words is "one hundred twenty-one billion, twenty million, two thousand, twenty-one".