221647656755311 has 16 divisors (see below), whose sum is σ = 229356045049824. Its totient is φ = 214030458100224.

The previous prime is 221647656755309. The next prime is 221647656755339. The reversal of 221647656755311 is 113557656746122.

It is a cyclic number.

It is not a de Polignac number, because 221647656755311 - 2¹ = 221647656755309 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221647656755311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221647656755381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15278236 + ... + 26013838.

It is an arithmetic number, because the mean of its divisors is an integer number (14334752815614).

Almost surely, 2^{221647656755311} is an apocalyptic number.

221647656755311 is a deficient number, since it is larger than the sum of its proper divisors (7708388294513).

221647656755311 is a wasteful number, since it uses less digits than its factorization.

221647656755311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10739850.

The product of its digits is 63504000, while the sum is 61.

The spelling of 221647656755311 in words is "two hundred twenty-one trillion, six hundred forty-seven billion, six hundred fifty-six million, seven hundred fifty-five thousand, three hundred eleven".