22154321 has 12 divisors (see below), whose sum is σ = 25879140. Its totient is φ = 18910080.

The previous prime is 22154311. The next prime is 22154329. The reversal of 22154321 is 12345122.

It can be written as a sum of positive squares in 2 ways, for example, as 19140625 + 3013696 = 4375^2 + 1736^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22154321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22154293 and 22154302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22154329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12965 + ... + 14573.

It is an arithmetic number, because the mean of its divisors is an integer number (2156595).

Almost surely, 2^22154321 is an apocalyptic number.

It is an amenable number.

22154321 is a deficient number, since it is larger than the sum of its proper divisors (3724819).

22154321 is a wasteful number, since it uses less digits than its factorization.

22154321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1904 (or 1897 counting only the distinct ones).

The product of its digits is 480, while the sum is 20.

The square root of 22154321 is about 4706.8376857504. The cubic root of 22154321 is about 280.8575790737.

Adding to 22154321 its reverse (12345122), we get a palindrome (34499443).

The spelling of 22154321 in words is "twenty-two million, one hundred fifty-four thousand, three hundred twenty-one".