121012010020021 has 4 divisors (see below), whose sum is σ = 121020179346252. Its totient is φ = 121003840693792.

The previous prime is 121012010020007. The next prime is 121012010020037. The reversal of 121012010020021 is 120020010210121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 72274312044900 + 48737697975121 = 8501430^2 + 6981239^2 .

It is a cyclic number.

It is not a de Polignac number, because 121012010020021 - 2¹³ = 121012010011829 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121012010019983 and 121012010020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121012010026021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4084640896 + ... + 4084670521.

It is an arithmetic number, because the mean of its divisors is an integer number (30255044836563).

Almost surely, 2^{121012010020021} is an apocalyptic number.

It is an amenable number.

121012010020021 is a deficient number, since it is larger than the sum of its proper divisors (8169326231).

121012010020021 is an equidigital number, since it uses as much as digits as its factorization.

121012010020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8169326230.

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

Adding to 121012010020021 its reverse (120020010210121), we get a palindrome (241032020230142).

The spelling of 121012010020021 in words is "one hundred twenty-one trillion, twelve billion, ten million, twenty thousand, twenty-one".