2001121505212 has 12 divisors (see below), whose sum is σ = 3501982307880. Its totient is φ = 1000555131536.

The previous prime is 2001121505209. The next prime is 2001121505213. The reversal of 2001121505212 is 2125051211002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001121505213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545863 + ... + 2073694.

It is an arithmetic number, because the mean of its divisors is an integer number (291831858990).

Almost surely, 2^{2001121505212} is an apocalyptic number.

It is an amenable number.

2001121505212 is a deficient number, since it is larger than the sum of its proper divisors (1500860802668).

2001121505212 is a wasteful number, since it uses less digits than its factorization.

2001121505212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810540 (or 2810538 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 22.

Adding to 2001121505212 its reverse (2125051211002), we get a palindrome (4126172716214).

The spelling of 2001121505212 in words is "two trillion, one billion, one hundred twenty-one million, five hundred five thousand, two hundred twelve".