2221784851 has 16 divisors (see below), whose sum is σ = 2625325920. Its totient is φ = 1853637120.

The previous prime is 2221784833. The next prime is 2221784879. The reversal of 2221784851 is 1584871222.

It is a cyclic number.

It is not a de Polignac number, because 2221784851 - 2⁹ = 2221784339 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2221784821) 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 15 ways as a sum of consecutive naturals, for example, 20166 + ... + 69643.

It is an arithmetic number, because the mean of its divisors is an integer number (164082870).

Almost surely, 2^2221784851 is an apocalyptic number.

2221784851 is a deficient number, since it is larger than the sum of its proper divisors (403541069).

2221784851 is a wasteful number, since it uses less digits than its factorization.

2221784851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90006.

The product of its digits is 71680, while the sum is 40.

The square root of 2221784851 is about 47135.8128284641. The cubic root of 2221784851 is about 1304.8702622501.

The spelling of 2221784851 in words is "two billion, two hundred twenty-one million, seven hundred eighty-four thousand, eight hundred fifty-one".