12121001020021 has 16 divisors (see below), whose sum is σ = 12213449973504. Its totient is φ = 12028751040384.

The previous prime is 12121001020019. The next prime is 12121001020049. The reversal of 12121001020021 is 12002010012121.

It is a cyclic number.

It is not a de Polignac number, because 12121001020021 - 2¹ = 12121001020019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121001019983 and 12121001020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121001020621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1075218441 + ... + 1075229713.

It is an arithmetic number, because the mean of its divisors is an integer number (763340623344).

Almost surely, 2^{12121001020021} is an apocalyptic number.

It is an amenable number.

12121001020021 is a deficient number, since it is larger than the sum of its proper divisors (92448953483).

12121001020021 is a wasteful number, since it uses less digits than its factorization.

12121001020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19380.

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

Adding to 12121001020021 its reverse (12002010012121), we get a palindrome (24123011032142).

The spelling of 12121001020021 in words is "twelve trillion, one hundred twenty-one billion, one million, twenty thousand, twenty-one".