2221131345 has 32 divisors (see below), whose sum is σ = 3783957120. Its totient is φ = 1108669440.

The previous prime is 2221131323. The next prime is 2221131383. The reversal of 2221131345 is 5431311222.

It is not a de Polignac number, because 2221131345 - 2¹⁰ = 2221130321 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21315 + ... + 69975.

It is an arithmetic number, because the mean of its divisors is an integer number (118248660).

Almost surely, 2^2221131345 is an apocalyptic number.

It is an amenable number.

2221131345 is a deficient number, since it is larger than the sum of its proper divisors (1562825775).

2221131345 is a wasteful number, since it uses less digits than its factorization.

2221131345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48865.

The product of its digits is 1440, while the sum is 24.

The square root of 2221131345 is about 47128.8801585610. The cubic root of 2221131345 is about 1304.7423134426.

Adding to 2221131345 its reverse (5431311222), we get a palindrome (7652442567).

The spelling of 2221131345 in words is "two billion, two hundred twenty-one million, one hundred thirty-one thousand, three hundred forty-five".