2211821653 has 4 divisors (see below), whose sum is σ = 2218385260. Its totient is φ = 2205258048.

The previous prime is 2211821627. The next prime is 2211821663. The reversal of 2211821653 is 3561281122.

2211821653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1263304849 + 948516804 = 35543^2 + 30798^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211821653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211821663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3281298 + ... + 3281971.

It is an arithmetic number, because the mean of its divisors is an integer number (554596315).

Almost surely, 2^2211821653 is an apocalyptic number.

It is an amenable number.

2211821653 is a deficient number, since it is larger than the sum of its proper divisors (6563607).

2211821653 is an equidigital number, since it uses as much as digits as its factorization.

2211821653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6563606.

The product of its digits is 5760, while the sum is 31.

The square root of 2211821653 is about 47030.0080055277. The cubic root of 2211821653 is about 1302.9168534223.

The spelling of 2211821653 in words is "two billion, two hundred eleven million, eight hundred twenty-one thousand, six hundred fifty-three".