2215221665071 has 16 divisors (see below), whose sum is σ = 2243156198400. Its totient is φ = 2187416446560.

The previous prime is 2215221665021. The next prime is 2215221665077. The reversal of 2215221665071 is 1705661225122.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2215221665071 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 (2215221665077) 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, 86509156 + ... + 86534758.

It is an arithmetic number, because the mean of its divisors is an integer number (140197262400).

Almost surely, 2^{2215221665071} is an apocalyptic number.

2215221665071 is a deficient number, since it is larger than the sum of its proper divisors (27934533329).

2215221665071 is a wasteful number, since it uses less digits than its factorization.

2215221665071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28086.

The product of its (nonzero) digits is 100800, while the sum is 40.

The spelling of 2215221665071 in words is "two trillion, two hundred fifteen billion, two hundred twenty-one million, six hundred sixty-five thousand, seventy-one".