2001020022221 has 8 divisors (see below), whose sum is σ = 2203332158304. Its totient is φ = 1802108090320.

The previous prime is 2001020022173. The next prime is 2001020022257. The reversal of 2001020022221 is 1222200201002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001020022221 is a prime.

It is a super-2 number, since 2×2001020022221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001020022196 and 2001020022205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001020072221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 850049810 + ... + 850052163.

It is an arithmetic number, because the mean of its divisors is an integer number (275416519788).

Almost surely, 2^{2001020022221} is an apocalyptic number.

It is an amenable number.

2001020022221 is a deficient number, since it is larger than the sum of its proper divisors (202312136083).

2001020022221 is a wasteful number, since it uses less digits than its factorization.

2001020022221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1700102091.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 2001020022221 its reverse (1222200201002), we get a palindrome (3223220223223).

The spelling of 2001020022221 in words is "two trillion, one billion, twenty million, twenty-two thousand, two hundred twenty-one".