221101144 has 16 divisors (see below), whose sum is σ = 452252520. Its totient is φ = 100500480.

The previous prime is 221101129. The next prime is 221101147. The reversal of 221101144 is 441101122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221101147) 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, 1256169 + ... + 1256344.

Almost surely, 2^221101144 is an apocalyptic number.

It is an amenable number.

221101144 is an abundant number, since it is smaller than the sum of its proper divisors (231151376).

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

221101144 is a wasteful number, since it uses less digits than its factorization.

221101144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512530 (or 2512526 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 221101144 is about 14869.4701990353. The cubic root of 221101144 is about 604.6865794585.

Adding to 221101144 its reverse (441101122), we get a palindrome (662202266).

The spelling of 221101144 in words is "two hundred twenty-one million, one hundred one thousand, one hundred forty-four".