221655563662771 has 16 divisors (see below), whose sum is σ = 259264391493888. Its totient is φ = 185534464802400.

The previous prime is 221655563662759. The next prime is 221655563662807. The reversal of 221655563662771 is 177266365556122.

It is not a de Polignac number, because 221655563662771 - 2¹⁹ = 221655563138483 is a prime.

It is a super-2 number, since 2×221655563662771² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221655563662471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73185940 + ... + 76154401.

It is an arithmetic number, because the mean of its divisors is an integer number (16204024468368).

Almost surely, 2^{221655563662771} is an apocalyptic number.

221655563662771 is a deficient number, since it is larger than the sum of its proper divisors (37608827831117).

221655563662771 is a wasteful number, since it uses less digits than its factorization.

221655563662771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149345322.

The product of its digits is 190512000, while the sum is 64.

The spelling of 221655563662771 in words is "two hundred twenty-one trillion, six hundred fifty-five billion, five hundred sixty-three million, six hundred sixty-two thousand, seven hundred seventy-one".