1021002010001 has 4 divisors (see below), whose sum is σ = 1021438151604. Its totient is φ = 1020565868400.

The previous prime is 1021002009959. The next prime is 1021002010037. The reversal of 1021002010001 is 1000102001201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 898939119376 + 122062890625 = 948124^2 + 349375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021002010001 - 2²⁶ = 1020934901137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1021002010801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218067290 + ... + 218071971.

It is an arithmetic number, because the mean of its divisors is an integer number (255359537901).

Almost surely, 2^{1021002010001} is an apocalyptic number.

It is an amenable number.

1021002010001 is a deficient number, since it is larger than the sum of its proper divisors (436141603).

1021002010001 is an equidigital number, since it uses as much as digits as its factorization.

1021002010001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436141602.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1021002010001 its reverse (1000102001201), we get a palindrome (2021104011202).

The spelling of 1021002010001 in words is "one trillion, twenty-one billion, two million, ten thousand, one".