221000144 has 40 divisors (see below), whose sum is σ = 436305408. Its totient is φ = 108426240.

The previous prime is 221000141. The next prime is 221000243. The reversal of 221000144 is 441000122.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221000141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202769 + ... + 203855.

Almost surely, 2^221000144 is an apocalyptic number.

It is an amenable number.

221000144 is a deficient number, since it is larger than the sum of its proper divisors (215305264).

221000144 is a wasteful number, since it uses less digits than its factorization.

221000144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323 (or 1317 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221000144 is about 14866.0735905618. The cubic root of 221000144 is about 604.5944909158.

Adding to 221000144 its reverse (441000122), we get a palindrome (662000266).

The spelling of 221000144 in words is "two hundred twenty-one million, one hundred forty-four", and thus it is an aban number.