21954224 has 10 divisors (see below), whose sum is σ = 42536340. Its totient is φ = 10977104.

The previous prime is 21954211. The next prime is 21954227. The reversal of 21954224 is 42245912.

It is not an unprimeable number, because it can be changed into a prime (21954227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686054 + ... + 686085.

It is an arithmetic number, because the mean of its divisors is an integer number (4253634).

Almost surely, 2^21954224 is an apocalyptic number.

It is an amenable number.

21954224 is a deficient number, since it is larger than the sum of its proper divisors (20582116).

21954224 is a wasteful number, since it uses less digits than its factorization.

21954224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1372147 (or 1372141 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 21954224 is about 4685.5334808323. The cubic root of 21954224 is about 280.0094554630.

The spelling of 21954224 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred twenty-four".