2001012001021 has 8 divisors (see below), whose sum is σ = 2241920080224. Its totient is φ = 1769936904720.

The previous prime is 2001012001013. The next prime is 2001012001031. The reversal of 2001012001021 is 1201002101002.

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

It is not a de Polignac number, because 2001012001021 - 2³ = 2001012001013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001012000989 and 2001012001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001012001031) 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, 2458245295 + ... + 2458246108.

It is an arithmetic number, because the mean of its divisors is an integer number (280240010028).

Almost surely, 2^{2001012001021} is an apocalyptic number.

It is an amenable number.

2001012001021 is a deficient number, since it is larger than the sum of its proper divisors (240908079203).

2001012001021 is a wasteful number, since it uses less digits than its factorization.

2001012001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4916491451.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 2001012001021 its reverse (1201002101002), we get a palindrome (3202014102023).

The spelling of 2001012001021 in words is "two trillion, one billion, twelve million, one thousand, twenty-one".