12002021090021 has 2 divisors, whose sum is σ = 12002021090022. Its totient is φ = 12002021090020.

The previous prime is 12002021090009. The next prime is 12002021090053. The reversal of 12002021090021 is 12009012020021.

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., 6905127873121 + 5096893216900 = 2627761^2 + 2257630^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12002021090021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12002021089975 and 12002021090002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12002021090921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6001010545010 + 6001010545011.

It is an arithmetic number, because the mean of its divisors is an integer number (6001010545011).

Almost surely, 2^{12002021090021} is an apocalyptic number.

It is an amenable number.

12002021090021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12002021090021 is an equidigital number, since it uses as much as digits as its factorization.

12002021090021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 12002021090021 in words is "twelve trillion, two billion, twenty-one million, ninety thousand, twenty-one".