221636757521272 has 8 divisors (see below), whose sum is σ = 415568920352400. Its totient is φ = 110818378760632.

The previous prime is 221636757521237. The next prime is 221636757521273. The reversal of 221636757521272 is 272125757636122.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221636757521273) 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 as a sum of consecutive naturals, namely, 13852297345072 + ... + 13852297345087.

It is an arithmetic number, because the mean of its divisors is an integer number (51946115044050).

Almost surely, 2^{221636757521272} is an apocalyptic number.

It is an amenable number.

221636757521272 is a deficient number, since it is larger than the sum of its proper divisors (193932162831128).

221636757521272 is a wasteful number, since it uses less digits than its factorization.

221636757521272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27704594690165 (or 27704594690161 counting only the distinct ones).

The product of its digits is 29635200, while the sum is 58.

The spelling of 221636757521272 in words is "two hundred twenty-one trillion, six hundred thirty-six billion, seven hundred fifty-seven million, five hundred twenty-one thousand, two hundred seventy-two".