100002020120021 has 2 divisors, whose sum is σ = 100002020120022. Its totient is φ = 100002020120020.

The previous prime is 100002020120011. The next prime is 100002020120033. The reversal of 100002020120021 is 120021020200001.

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., 83744278416100 + 16257741703921 = 9151190^2 + 4032089^2 .

It is a cyclic number.

It is not a de Polignac number, because 100002020120021 - 2¹⁰ = 100002020118997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 100002020119984 and 100002020120011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100002020120011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50001010060010 + 50001010060011.

It is an arithmetic number, because the mean of its divisors is an integer number (50001010060011).

Almost surely, 2^{100002020120021} is an apocalyptic number.

It is an amenable number.

100002020120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100002020120021 is an equidigital number, since it uses as much as digits as its factorization.

100002020120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 100002020120021 its reverse (120021020200001), we get a palindrome (220023040320022).

The spelling of 100002020120021 in words is "one hundred trillion, two billion, twenty million, one hundred twenty thousand, twenty-one".