10000002100021 has 2 divisors, whose sum is σ = 10000002100022. Its totient is φ = 10000002100020.

The previous prime is 10000002099917. The next prime is 10000002100087. The reversal of 10000002100021 is 12000120000001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9955444800625 + 44557299396 = 3155225^2 + 211086^2 .

It is a cyclic number.

It is not a de Polignac number, because 10000002100021 - 2²¹ = 10000000002869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10000002099977 and 10000002100013.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10000002100421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5000001050010 + 5000001050011.

It is an arithmetic number, because the mean of its divisors is an integer number (5000001050011).

Almost surely, 2^{10000002100021} is an apocalyptic number.

It is an amenable number.

10000002100021 is a deficient number, since it is larger than the sum of its proper divisors (1).

10000002100021 is an equidigital number, since it uses as much as digits as its factorization.

10000002100021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 10000002100021 its reverse (12000120000001), we get a palindrome (22000122100022).

The spelling of 10000002100021 in words is "ten trillion, two million, one hundred thousand, twenty-one".