2211121021 has 4 divisors (see below), whose sum is σ = 2265050844. Its totient is φ = 2157191200.

The previous prime is 2211121019. The next prime is 2211121061. The reversal of 2211121021 is 1201211122.

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 502208100 + 1708912921 = 22410^2 + 41339^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211121021 - 2¹ = 2211121019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2211120992 and 2211121010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211121061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26964850 + ... + 26964931.

It is an arithmetic number, because the mean of its divisors is an integer number (566262711).

Almost surely, 2^2211121021 is an apocalyptic number.

It is an amenable number.

2211121021 is a deficient number, since it is larger than the sum of its proper divisors (53929823).

2211121021 is an equidigital number, since it uses as much as digits as its factorization.

2211121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53929822.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 2211121021 is about 47022.5586394445. The cubic root of 2211121021 is about 1302.7792652274.

Adding to 2211121021 its reverse (1201211122), we get a palindrome (3412332143).

The spelling of 2211121021 in words is "two billion, two hundred eleven million, one hundred twenty-one thousand, twenty-one".