2001021220122 has 32 divisors (see below), whose sum is σ = 4176131333760. Its totient is φ = 637993466880.

The previous prime is 2001021220103. The next prime is 2001021220123. The reversal of 2001021220122 is 2210221201002.

It is not an unprimeable number, because it can be changed into a prime (2001021220123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8132422 + ... + 8374862.

It is an arithmetic number, because the mean of its divisors is an integer number (130504104180).

Almost surely, 2^{2001021220122} is an apocalyptic number.

2001021220122 is an abundant number, since it is smaller than the sum of its proper divisors (2175110113638).

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

2001021220122 is a wasteful number, since it uses less digits than its factorization.

2001021220122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302278.

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

Adding to 2001021220122 its reverse (2210221201002), we get a palindrome (4211242421124).

The spelling of 2001021220122 in words is "two trillion, one billion, twenty-one million, two hundred twenty thousand, one hundred twenty-two".