2001221100122 has 8 divisors (see below), whose sum is σ = 3001841321076. Its totient is φ = 1000607326432.

The previous prime is 2001221100049. The next prime is 2001221100133. The reversal of 2001221100122 is 2210011221002.

It can be written as a sum of positive squares in 2 ways, for example, as 1975461171121 + 25759929001 = 1405511^2 + 160499^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2001221100097 and 2001221100106.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 741923 + ... + 2133750.

Almost surely, 2^{2001221100122} is an apocalyptic number.

2001221100122 is a deficient number, since it is larger than the sum of its proper divisors (1000620220954).

2001221100122 is a wasteful number, since it uses less digits than its factorization.

2001221100122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223632.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2001221100122 its reverse (2210011221002), we get a palindrome (4211232321124).

The spelling of 2001221100122 in words is "two trillion, one billion, two hundred twenty-one million, one hundred thousand, one hundred twenty-two".