21445030 has 8 divisors (see below), whose sum is σ = 38601072. Its totient is φ = 8578008.

The previous prime is 21445013. The next prime is 21445031. The reversal of 21445030 is 3054412.

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

It is a junction number, because it is equal to n+sod(n) for n = 21444989 and 21445007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21445031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1072242 + ... + 1072261.

It is an arithmetic number, because the mean of its divisors is an integer number (4825134).

Almost surely, 2^21445030 is an apocalyptic number.

21445030 is a deficient number, since it is larger than the sum of its proper divisors (17156042).

21445030 is a wasteful number, since it uses less digits than its factorization.

21445030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2144510.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 21445030 is about 4630.8778865351. The cubic root of 21445030 is about 277.8277058105.

Adding to 21445030 its reverse (3054412), we get a palindrome (24499442).

The spelling of 21445030 in words is "twenty-one million, four hundred forty-five thousand, thirty".