2001210011001 has 24 divisors (see below), whose sum is σ = 2902530286656. Its totient is φ = 1328652036000.

The previous prime is 2001210010981. The next prime is 2001210011023. The reversal of 2001210011001 is 1001100121002.

It is a happy number.

It is not a de Polignac number, because 2001210011001 - 2¹¹ = 2001210008953 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 (2001210011071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18680476 + ... + 18787298.

It is an arithmetic number, because the mean of its divisors is an integer number (120938761944).

Almost surely, 2^{2001210011001} is an apocalyptic number.

It is an amenable number.

2001210011001 is a deficient number, since it is larger than the sum of its proper divisors (901320275655).

2001210011001 is a wasteful number, since it uses less digits than its factorization.

2001210011001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115373 (or 115370 counting only the distinct ones).

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

Adding to 2001210011001 its reverse (1001100121002), we get a palindrome (3002310132003).

The spelling of 2001210011001 in words is "two trillion, one billion, two hundred ten million, eleven thousand, one".