2101001121221 has 8 divisors (see below), whose sum is σ = 2140484395200. Its totient is φ = 2061807102432.

The previous prime is 2101001121203. The next prime is 2101001121229. The reversal of 2101001121221 is 1221211001012.

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-2101001121221 is a prime.

It is a super-2 number, since 2×2101001121221² (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 = 2101001121196 and 2101001121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101001121229) 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, 72299135 + ... + 72328188.

It is an arithmetic number, because the mean of its divisors is an integer number (267560549400).

Almost surely, 2^{2101001121221} is an apocalyptic number.

It is an amenable number.

2101001121221 is a deficient number, since it is larger than the sum of its proper divisors (39483273979).

2101001121221 is a wasteful number, since it uses less digits than its factorization.

2101001121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144627595.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 2101001121221 its reverse (1221211001012), we get a palindrome (3322212122233).

It can be divided in two parts, 2101001 and 121221, that added together give a palindrome (2222222).

The spelling of 2101001121221 in words is "two trillion, one hundred one billion, one million, one hundred twenty-one thousand, two hundred twenty-one".