1012002100001 has 2 divisors, whose sum is σ = 1012002100002. Its totient is φ = 1012002100000.

The previous prime is 1012002099989. The next prime is 1012002100003. The reversal of 1012002100001 is 1000012002101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 642484005601 + 369518094400 = 801551^2 + 607880^2 .

It is a cyclic number.

It is not a de Polignac number, because 1012002100001 - 2¹⁰ = 1012002098977 is a prime.

Together with 1012002100003, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1012002100003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 506001050000 + 506001050001.

It is an arithmetic number, because the mean of its divisors is an integer number (506001050001).

Almost surely, 2^{1012002100001} is an apocalyptic number.

It is an amenable number.

1012002100001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1012002100001 is an equidigital number, since it uses as much as digits as its factorization.

1012002100001 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 8.

Adding to 1012002100001 its reverse (1000012002101), we get a palindrome (2012014102102).

The spelling of 1012002100001 in words is "one trillion, twelve billion, two million, one hundred thousand, one".