1012021020121 has 4 divisors (see below), whose sum is σ = 1022454226612. Its totient is φ = 1001587813632.

The previous prime is 1012021020079. The next prime is 1012021020133. The reversal of 1012021020121 is 1210201202101.

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 779538897225 + 232482122896 = 882915^2 + 482164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1012021020121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1012021020151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5216603100 + ... + 5216603293.

It is an arithmetic number, because the mean of its divisors is an integer number (255613556653).

Almost surely, 2^{1012021020121} is an apocalyptic number.

It is an amenable number.

1012021020121 is a deficient number, since it is larger than the sum of its proper divisors (10433206491).

1012021020121 is an equidigital number, since it uses as much as digits as its factorization.

1012021020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10433206490.

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

Adding to 1012021020121 its reverse (1210201202101), we get a palindrome (2222222222222).

The spelling of 1012021020121 in words is "one trillion, twelve billion, twenty-one million, twenty thousand, one hundred twenty-one".