2001100212221 has 8 divisors (see below), whose sum is σ = 2183319481824. Its totient is φ = 1818931120720.

The previous prime is 2001100212211. The next prime is 2001100212229. The reversal of 2001100212221 is 1222120011002.

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

It is a cyclic number.

It is not a de Polignac number, because 2001100212221 - 2¹⁸ = 2001099950077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001100212196 and 2001100212205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001100212229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12461111 + ... + 12620676.

It is an arithmetic number, because the mean of its divisors is an integer number (272914935228).

Almost surely, 2^{2001100212221} is an apocalyptic number.

It is an amenable number.

2001100212221 is a deficient number, since it is larger than the sum of its proper divisors (182219269603).

2001100212221 is a wasteful number, since it uses less digits than its factorization.

2001100212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25089051.

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

Adding to 2001100212221 its reverse (1222120011002), we get a palindrome (3223220223223).

It can be divided in two parts, 20011002 and 12221, that multiplied together give a palindrome (244554455442).

The spelling of 2001100212221 in words is "two trillion, one billion, one hundred million, two hundred twelve thousand, two hundred twenty-one".