8001520121 has 16 divisors (see below), whose sum is σ = 9484214400. Its totient is φ = 6745994640.

The previous prime is 8001520099. The next prime is 8001520133. The reversal of 8001520121 is 1210251008.

It is a happy number.

It is not a de Polignac number, because 8001520121 - 2⁶ = 8001520057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8001520093 and 8001520102.

It is not an unprimeable number, because it can be changed into a prime (8001520151) 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, 170291 + ... + 212136.

It is an arithmetic number, because the mean of its divisors is an integer number (592763400).

Almost surely, 2^8001520121 is an apocalyptic number.

It is an amenable number.

8001520121 is a deficient number, since it is larger than the sum of its proper divisors (1482694279).

8001520121 is an equidigital number, since it uses as much as digits as its factorization.

8001520121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382509 (or 382495 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 8001520121 is about 89451.2164310805. The cubic root of 8001520121 is about 2000.1266687273.

Adding to 8001520121 its reverse (1210251008), we get a palindrome (9211771129).

The spelling of 8001520121 in words is "eight billion, one million, five hundred twenty thousand, one hundred twenty-one".