22001144 has 16 divisors (see below), whose sum is σ = 45002520. Its totient is φ = 10000480.

The previous prime is 22001143. The next prime is 22001173. The reversal of 22001144 is 44110022.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001143) 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, 124919 + ... + 125094.

Almost surely, 2^22001144 is an apocalyptic number.

It is an amenable number.

22001144 is an abundant number, since it is smaller than the sum of its proper divisors (23001376).

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

22001144 is a wasteful number, since it uses less digits than its factorization.

22001144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250030 (or 250026 counting only the distinct ones).

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

The square root of 22001144 is about 4690.5377090479. The cubic root of 22001144 is about 280.2087898495.

Adding to 22001144 its reverse (44110022), we get a palindrome (66111166).

The spelling of 22001144 in words is "twenty-two million, one thousand, one hundred forty-four".