21954266 has 8 divisors (see below), whose sum is σ = 33471444. Its totient is φ = 10797120.

The previous prime is 21954263. The next prime is 21954281. The reversal of 21954266 is 66245912.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21949225 + 5041 = 4685^2 + 71^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21954263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89855 + ... + 90098.

Almost surely, 2^21954266 is an apocalyptic number.

21954266 is a deficient number, since it is larger than the sum of its proper divisors (11517178).

21954266 is a wasteful number, since it uses less digits than its factorization.

21954266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180016.

The product of its digits is 25920, while the sum is 35.

The square root of 21954266 is about 4685.5379627104. The cubic root of 21954266 is about 280.0096340223.

The spelling of 21954266 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred sixty-six".