2001210002001 has 144 divisors (see below), whose sum is σ = 3544746004800. Its totient is φ = 1124804403072.

The previous prime is 2001210001991. The next prime is 2001210002003. The reversal of 2001210002001 is 1002000121002.

It is not a de Polignac number, because 2001210002001 - 2⁵ = 2001210001969 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2001210002003) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 180397411 + ... + 180408503.

It is an arithmetic number, because the mean of its divisors is an integer number (24616291700).

Almost surely, 2^{2001210002001} is an apocalyptic number.

2001210002001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2001210002001 is a deficient number, since it is larger than the sum of its proper divisors (1543536002799).

2001210002001 is a wasteful number, since it uses less digits than its factorization.

2001210002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11370 (or 11351 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 2001210002001 its reverse (1002000121002), we get a palindrome (3003210123003).

The spelling of 2001210002001 in words is "two trillion, one billion, two hundred ten million, two thousand, one".