1001120002001 has 20 divisors (see below), whose sum is σ = 1169895104112. Its totient is φ = 856639808136.

The previous prime is 1001120001997. The next prime is 1001120002019. The reversal of 1001120002001 is 1002000211001.

It is not a de Polignac number, because 1001120002001 - 2² = 1001120001997 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001120002001.

It is not an unprimeable number, because it can be changed into a prime (1001120002081) 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, 1054226 + ... + 1764548.

Almost surely, 2^{1001120002001} is an apocalyptic number.

It is an amenable number.

1001120002001 is a deficient number, since it is larger than the sum of its proper divisors (168775102111).

1001120002001 is an frugal number, since it uses more digits than its factorization.

1001120002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710938 (or 710917 counting only the distinct ones).

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

Adding to 1001120002001 its reverse (1002000211001), we get a palindrome (2003120213002).

The spelling of 1001120002001 in words is "one trillion, one billion, one hundred twenty million, two thousand, one".