2001221120122 has 16 divisors (see below), whose sum is σ = 3436316628480. Its totient is φ = 856253231568.

The previous prime is 2001221120077. The next prime is 2001221120141. The reversal of 2001221120122 is 2210211221002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2001221120096 and 2001221120105.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117738097 + ... + 117755092.

It is an arithmetic number, because the mean of its divisors is an integer number (214769789280).

Almost surely, 2^{2001221120122} is an apocalyptic number.

2001221120122 is a deficient number, since it is larger than the sum of its proper divisors (1435095508358).

2001221120122 is a wasteful number, since it uses less digits than its factorization.

2001221120122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235493805.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2001221120122 its reverse (2210211221002), we get a palindrome (4211432341124).

The spelling of 2001221120122 in words is "two trillion, one billion, two hundred twenty-one million, one hundred twenty thousand, one hundred twenty-two".