2111020002221 has 4 divisors (see below), whose sum is σ = 2273406156252. Its totient is φ = 1948633848192.

The previous prime is 2111020002137. The next prime is 2111020002227. The reversal of 2111020002221 is 1222000201112.

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 1087859430025 + 1023160572196 = 1043005^2 + 1011514^2 .

It is a cyclic number.

It is not a de Polignac number, because 2111020002221 - 2³⁴ = 2093840133037 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111020002196 and 2111020002205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111020002227) 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, 81193076996 + ... + 81193077021.

It is an arithmetic number, because the mean of its divisors is an integer number (568351539063).

Almost surely, 2^{2111020002221} is an apocalyptic number.

It is an amenable number.

2111020002221 is a deficient number, since it is larger than the sum of its proper divisors (162386154031).

2111020002221 is a wasteful number, since it uses less digits than its factorization.

2111020002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162386154030.

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

Adding to 2111020002221 its reverse (1222000201112), we get a palindrome (3333020203333).

The spelling of 2111020002221 in words is "two trillion, one hundred eleven billion, twenty million, two thousand, two hundred twenty-one".