2001020000121 has 12 divisors (see below), whose sum is σ = 2911156197040. Its totient is φ = 1324416114360.

The previous prime is 2001020000107. The next prime is 2001020000141. The reversal of 2001020000121 is 1210000201002.

It is not a de Polignac number, because 2001020000121 - 2³⁹ = 1451264186233 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001020000141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 799766935 + ... + 799769436.

Almost surely, 2^{2001020000121} is an apocalyptic number.

It is an amenable number.

2001020000121 is a deficient number, since it is larger than the sum of its proper divisors (910136196919).

2001020000121 is a wasteful number, since it uses less digits than its factorization.

2001020000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599536516 (or 1599536513 counting only the distinct ones).

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

Adding to 2001020000121 its reverse (1210000201002), we get a palindrome (3211020201123).

The spelling of 2001020000121 in words is "two trillion, one billion, twenty million, one hundred twenty-one", and thus it is an aban number.