2001010220021 has 8 divisors (see below), whose sum is σ = 2009373990624. Its totient is φ = 1992649558000.

The previous prime is 2001010220017. The next prime is 2001010220029. The reversal of 2001010220021 is 1200220101002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2001010220021 - 2² = 2001010220017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001010219984 and 2001010220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001010220029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517451 + ... + 2066343.

It is an arithmetic number, because the mean of its divisors is an integer number (251171748828).

Almost surely, 2^{2001010220021} is an apocalyptic number.

It is an amenable number.

2001010220021 is a deficient number, since it is larger than the sum of its proper divisors (8363770603).

2001010220021 is a wasteful number, since it uses less digits than its factorization.

2001010220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1554291.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 2001010220021 its reverse (1200220101002), we get a palindrome (3201230321023).

The spelling of 2001010220021 in words is "two trillion, one billion, ten million, two hundred twenty thousand, twenty-one".