2001221110122 has 16 divisors (see below), whose sum is σ = 4310322391200. Its totient is φ = 615760341552.

The previous prime is 2001221110087. The next prime is 2001221110159. The reversal of 2001221110122 is 2210111221002.

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, 12828340372 + ... + 12828340527.

It is an arithmetic number, because the mean of its divisors is an integer number (269395149450).

Almost surely, 2^{2001221110122} is an apocalyptic number.

2001221110122 is an abundant number, since it is smaller than the sum of its proper divisors (2309101281078).

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

2001221110122 is a wasteful number, since it uses less digits than its factorization.

2001221110122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25656680917.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001221110122 its reverse (2210111221002), we get a palindrome (4211332331124).

The spelling of 2001221110122 in words is "two trillion, one billion, two hundred twenty-one million, one hundred ten thousand, one hundred twenty-two".