2216720705 has 16 divisors (see below), whose sum is σ = 2755544400. Its totient is φ = 1709890560.

The previous prime is 2216720699. The next prime is 2216720711. The reversal of 2216720705 is 5070276122.

It is an interprime number because it is at equal distance from previous prime (2216720699) and next prime (2216720711).

It can be written as a sum of positive squares in 8 ways, for example, as 775455409 + 1441265296 = 27847^2 + 37964^2 .

It is not a de Polignac number, because 2216720705 - 2¹⁶ = 2216655169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100301 + ... + 120389.

It is an arithmetic number, because the mean of its divisors is an integer number (172221525).

Almost surely, 2^2216720705 is an apocalyptic number.

It is an amenable number.

2216720705 is a deficient number, since it is larger than the sum of its proper divisors (538823695).

2216720705 is a wasteful number, since it uses less digits than its factorization.

2216720705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20884.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 2216720705 is about 47082.0635168001. The cubic root of 2216720705 is about 1303.8781049021.

Adding to 2216720705 its reverse (5070276122), we get a palindrome (7286996827).

The spelling of 2216720705 in words is "two billion, two hundred sixteen million, seven hundred twenty thousand, seven hundred five".