1021110002001 has 20 divisors (see below), whose sum is σ = 1525524192192. Its totient is φ = 680667553368.

The previous prime is 1021110001993. The next prime is 1021110002039. The reversal of 1021110002001 is 1002000111201.

It is a happy number.

It is not a de Polignac number, because 1021110002001 - 2³ = 1021110001993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1021110002501) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 100420 + ... + 1432586.

Almost surely, 2^{1021110002001} is an apocalyptic number.

It is an amenable number.

1021110002001 is a deficient number, since it is larger than the sum of its proper divisors (504414190191).

1021110002001 is an equidigital number, since it uses as much as digits as its factorization.

1021110002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1341642 (or 1341633 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1021110002001 its reverse (1002000111201), we get a palindrome (2023110113202).

The spelling of 1021110002001 in words is "one trillion, twenty-one billion, one hundred ten million, two thousand, one".