2101111021221 has 8 divisors (see below), whose sum is σ = 2801528527200. Its totient is φ = 1400717098032.

The previous prime is 2101111021091. The next prime is 2101111021297. The reversal of 2101111021221 is 1221201111012.

It is a happy number.

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

It is not a de Polignac number, because 2101111021221 - 2⁹ = 2101111020709 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2101111021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2101111021021) 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, 5686750 + ... + 6044943.

It is an arithmetic number, because the mean of its divisors is an integer number (350191065900).

Almost surely, 2^{2101111021221} is an apocalyptic number.

It is an amenable number.

2101111021221 is a deficient number, since it is larger than the sum of its proper divisors (700417505979).

2101111021221 is a wasteful number, since it uses less digits than its factorization.

2101111021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11791395.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 2101111021221 its reverse (1221201111012), we get a palindrome (3322312132233).

The spelling of 2101111021221 in words is "two trillion, one hundred one billion, one hundred eleven million, twenty-one thousand, two hundred twenty-one".