22721546 has 4 divisors (see below), whose sum is σ = 34082322. Its totient is φ = 11360772.

The previous prime is 22721507. The next prime is 22721563. The reversal of 22721546 is 64512722.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15295921 + 7425625 = 3911^2 + 2725^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5680385 + ... + 5680388.

Almost surely, 2^22721546 is an apocalyptic number.

22721546 is a deficient number, since it is larger than the sum of its proper divisors (11360776).

22721546 is a wasteful number, since it uses less digits than its factorization.

22721546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11360775.

The product of its digits is 6720, while the sum is 29.

The square root of 22721546 is about 4766.7122841640. The cubic root of 22721546 is about 283.2343740528.

The spelling of 22721546 in words is "twenty-two million, seven hundred twenty-one thousand, five hundred forty-six".