2001220011987 has 16 divisors (see below), whose sum is σ = 3131896442112. Its totient is φ = 1112647419360.

The previous prime is 2001220011983. The next prime is 2001220012013. The reversal of 2001220011987 is 7891100221002.

It is not a de Polignac number, because 2001220011987 - 2² = 2001220011983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2001220011983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1287785589 + ... + 1287787142.

It is an arithmetic number, because the mean of its divisors is an integer number (195743527632).

Almost surely, 2^{2001220011987} is an apocalyptic number.

2001220011987 is a deficient number, since it is larger than the sum of its proper divisors (1130676430125).

2001220011987 is a wasteful number, since it uses less digits than its factorization.

2001220011987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2575572778.

The product of its (nonzero) digits is 4032, while the sum is 33.

Adding to 2001220011987 its reverse (7891100221002), we get a palindrome (9892320232989).

The spelling of 2001220011987 in words is "two trillion, one billion, two hundred twenty million, eleven thousand, nine hundred eighty-seven".