2111311312221 has 8 divisors (see below), whose sum is σ = 2833012207264. Its totient is φ = 1398575646000.

The previous prime is 2111311312193. The next prime is 2111311312267. The reversal of 2111311312221 is 1222131131112.

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

It is not a de Polignac number, because 2111311312221 - 2⁷ = 2111311312093 is a prime.

It is a super-2 number, since 2×2111311312221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111311312321) 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, 2241306655 + ... + 2241307596.

It is an arithmetic number, because the mean of its divisors is an integer number (354126525908).

Almost surely, 2^{2111311312221} is an apocalyptic number.

It is an amenable number.

2111311312221 is a deficient number, since it is larger than the sum of its proper divisors (721700895043).

2111311312221 is a wasteful number, since it uses less digits than its factorization.

2111311312221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4482614411.

The product of its digits is 144, while the sum is 21.

Adding to 2111311312221 its reverse (1222131131112), we get a palindrome (3333442443333).

The spelling of 2111311312221 in words is "two trillion, one hundred eleven billion, three hundred eleven million, three hundred twelve thousand, two hundred twenty-one".