2001072869521 has 16 divisors (see below), whose sum is σ = 2204320392000. Its totient is φ = 1801395002880.

The previous prime is 2001072869501. The next prime is 2001072869539. The reversal of 2001072869521 is 1259682701002.

It is not a de Polignac number, because 2001072869521 - 2²¹ = 2001070772369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001072869501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2440105 + ... + 3155353.

It is an arithmetic number, because the mean of its divisors is an integer number (137770024500).

Almost surely, 2^{2001072869521} is an apocalyptic number.

It is an amenable number.

2001072869521 is a deficient number, since it is larger than the sum of its proper divisors (203247522479).

2001072869521 is a wasteful number, since it uses less digits than its factorization.

2001072869521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717744.

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 2001072869521 in words is "two trillion, one billion, seventy-two million, eight hundred sixty-nine thousand, five hundred twenty-one".