2001121000002 has 48 divisors (see below), whose sum is σ = 4405258859040. Its totient is φ = 656419579200.

The previous prime is 2001120999979. The next prime is 2001121000009. The reversal of 2001121000002 is 2000001211002.

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

It is not an unprimeable number, because it can be changed into a prime (2001121000009) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2622024 + ... + 3298067.

It is an arithmetic number, because the mean of its divisors is an integer number (91776226230).

Almost surely, 2^{2001121000002} is an apocalyptic number.

2001121000002 is an abundant number, since it is smaller than the sum of its proper divisors (2404137859038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001121000002 is a wasteful number, since it uses less digits than its factorization.

2001121000002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5920399 (or 5920396 counting only the distinct ones).

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

Adding to 2001121000002 its reverse (2000001211002), we get a palindrome (4001122211004).

The spelling of 2001121000002 in words is "two trillion, one billion, one hundred twenty-one million, two", and thus it is an aban number.