221101424 has 20 divisors (see below), whose sum is σ = 442203840. Its totient is φ = 106984320.

The previous prime is 221101421. The next prime is 221101453. The reversal of 221101424 is 424101122.

221101424 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222389 + ... + 223380.

It is an arithmetic number, because the mean of its divisors is an integer number (22110192).

Almost surely, 2^221101424 is an apocalyptic number.

It is an amenable number.

221101424 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221101424 is a wasteful number, since it uses less digits than its factorization.

221101424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445808 (or 445802 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 221101424 is about 14869.4796142972. The cubic root of 221101424 is about 604.6868347145.

Adding to 221101424 its reverse (424101122), we get a palindrome (645202546).

The spelling of 221101424 in words is "two hundred twenty-one million, one hundred one thousand, four hundred twenty-four".