221427634851844 has 6 divisors (see below), whose sum is σ = 387498360990734. Its totient is φ = 110713817425920.

The previous prime is 221427634851779. The next prime is 221427634851847. The reversal of 221427634851844 is 448158436724122.

It can be written as a sum of positive squares in only one way, i.e., 187155040533444 + 34272594318400 = 13680462^2 + 5854280^2 .

It is not an unprimeable number, because it can be changed into a prime (221427634851847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27678454356477 + ... + 27678454356484.

Almost surely, 2^{221427634851844} is an apocalyptic number.

It is an amenable number.

221427634851844 is a deficient number, since it is larger than the sum of its proper divisors (166070726138890).

221427634851844 is a wasteful number, since it uses less digits than its factorization.

221427634851844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55356908712965 (or 55356908712963 counting only the distinct ones).

The product of its digits is 82575360, while the sum is 61.

The spelling of 221427634851844 in words is "two hundred twenty-one trillion, four hundred twenty-seven billion, six hundred thirty-four million, eight hundred fifty-one thousand, eight hundred forty-four".