1000102120021 has 2 divisors, whose sum is σ = 1000102120022. Its totient is φ = 1000102120020.

The previous prime is 1000102120001. The next prime is 1000102120051. The reversal of 1000102120021 is 1200212010001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 979335868996 + 20766251025 = 989614^2 + 144105^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000102120021 - 2⁹ = 1000102119509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000102120001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500051060010 + 500051060011.

It is an arithmetic number, because the mean of its divisors is an integer number (500051060011).

Almost surely, 2^{1000102120021} is an apocalyptic number.

It is an amenable number.

1000102120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000102120021 is an equidigital number, since it uses as much as digits as its factorization.

1000102120021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1000102120021 its reverse (1200212010001), we get a palindrome (2200314130022).

The spelling of 1000102120021 in words is "one trillion, one hundred two million, one hundred twenty thousand, twenty-one".