221100424 has 8 divisors (see below), whose sum is σ = 414563310. Its totient is φ = 110550208.

The previous prime is 221100421. The next prime is 221100443. The reversal of 221100424 is 424001122.

221100424 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 196280100 + 24820324 = 14010^2 + 4982^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 221100398 and 221100407.

It is not an unprimeable number, because it can be changed into a prime (221100421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13818769 + ... + 13818784.

Almost surely, 2^221100424 is an apocalyptic number.

It is an amenable number.

221100424 is a deficient number, since it is larger than the sum of its proper divisors (193462886).

221100424 is a wasteful number, since it uses less digits than its factorization.

221100424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27637559 (or 27637555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 221100424 is about 14869.4459883346. The cubic root of 221100424 is about 604.6859230850.

Adding to 221100424 its reverse (424001122), we get a palindrome (645101546).

The spelling of 221100424 in words is "two hundred twenty-one million, one hundred thousand, four hundred twenty-four".