221543275155021 has 16 divisors (see below), whose sum is σ = 328212556156800. Its totient is φ = 147695383269504.

The previous prime is 221543275154983. The next prime is 221543275155029. The reversal of 221543275155021 is 120551572345122.

It is a happy number.

221543275155021 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 4 + 3 + 2 + 75 + 1 + 550 + 21 = 666.

It is not a de Polignac number, because 221543275155021 - 2¹⁷ = 221543275023949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221543275155029) 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, 33505725 + ... + 39569181.

It is an arithmetic number, because the mean of its divisors is an integer number (20513284759800).

Almost surely, 2^{221543275155021} is an apocalyptic number.

It is an amenable number.

221543275155021 is a deficient number, since it is larger than the sum of its proper divisors (106669281001779).

221543275155021 is a wasteful number, since it uses less digits than its factorization.

221543275155021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7416705 (or 7416699 counting only the distinct ones).

The product of its (nonzero) digits is 840000, while the sum is 45.

The spelling of 221543275155021 in words is "two hundred twenty-one trillion, five hundred forty-three billion, two hundred seventy-five million, one hundred fifty-five thousand, twenty-one".