2001221022012 has 48 divisors (see below), whose sum is σ = 4690268718240. Its totient is φ = 664109411328.

The previous prime is 2001221021977. The next prime is 2001221022023. The reversal of 2001221022012 is 2102201221002.

It is a junction number, because it is equal to n+sod(n) for n = 2001221021982 and 2001221022000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55582288 + ... + 55618280.

It is an arithmetic number, because the mean of its divisors is an integer number (97713931630).

Almost surely, 2^{2001221022012} is an apocalyptic number.

It is an amenable number.

2001221022012 is an abundant number, since it is smaller than the sum of its proper divisors (2689047696228).

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

2001221022012 is a wasteful number, since it uses less digits than its factorization.

2001221022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56462 (or 56460 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2001221022012 its reverse (2102201221002), we get a palindrome (4103422243014).

The spelling of 2001221022012 in words is "two trillion, one billion, two hundred twenty-one million, twenty-two thousand, twelve".