221527811381821 has 8 divisors (see below), whose sum is σ = 261904801633920. Its totient is φ = 183333361143408.

The previous prime is 221527811381819. The next prime is 221527811381837. The reversal of 221527811381821 is 128183118725122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221527811381821 - 2¹ = 221527811381819 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 (221527811381881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545635003201 + ... + 545635003606.

It is an arithmetic number, because the mean of its divisors is an integer number (32738100204240).

Almost surely, 2^{221527811381821} is an apocalyptic number.

It is an amenable number.

221527811381821 is a deficient number, since it is larger than the sum of its proper divisors (40376990252099).

221527811381821 is a wasteful number, since it uses less digits than its factorization.

221527811381821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091270006843.

The product of its digits is 860160, while the sum is 52.

The spelling of 221527811381821 in words is "two hundred twenty-one trillion, five hundred twenty-seven billion, eight hundred eleven million, three hundred eighty-one thousand, eight hundred twenty-one".