2001021111987 has 8 divisors (see below), whose sum is σ = 2668034856960. Its totient is φ = 1334010720840.

The previous prime is 2001021111967. The next prime is 2001021111997. The reversal of 2001021111987 is 7891111201002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2001021111987 - 2²⁶ = 2000954003123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001021111967) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1432062 + ... + 2460252.

It is an arithmetic number, because the mean of its divisors is an integer number (333504357120).

Almost surely, 2^{2001021111987} is an apocalyptic number.

2001021111987 is a deficient number, since it is larger than the sum of its proper divisors (667013744973).

2001021111987 is a wasteful number, since it uses less digits than its factorization.

2001021111987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1676913.

The product of its (nonzero) digits is 2016, while the sum is 33.

Adding to 2001021111987 its reverse (7891111201002), we get a palindrome (9892132312989).

The spelling of 2001021111987 in words is "two trillion, one billion, twenty-one million, one hundred eleven thousand, nine hundred eighty-seven".