2112211001221 has 4 divisors (see below), whose sum is σ = 2141145398572. Its totient is φ = 2083276603872.

The previous prime is 2112211001203. The next prime is 2112211001233. The reversal of 2112211001221 is 1221001122112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1820108584996 + 292102416225 = 1349114^2 + 540465^2 .

It is a cyclic number.

It is not a de Polignac number, because 2112211001221 - 2¹⁷ = 2112210870149 is a prime.

It is a super-2 number, since 2×2112211001221² (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 = 2112211001195 and 2112211001204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112211001291) 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 3 ways as a sum of consecutive naturals, for example, 14467198566 + ... + 14467198711.

It is an arithmetic number, because the mean of its divisors is an integer number (535286349643).

Almost surely, 2^{2112211001221} is an apocalyptic number.

It is an amenable number.

2112211001221 is a deficient number, since it is larger than the sum of its proper divisors (28934397351).

2112211001221 is an equidigital number, since it uses as much as digits as its factorization.

2112211001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28934397350.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 2112211001221 its reverse (1221001122112), we get a palindrome (3333212123333).

The spelling of 2112211001221 in words is "two trillion, one hundred twelve billion, two hundred eleven million, one thousand, two hundred twenty-one".