21063445 has 8 divisors (see below), whose sum is σ = 27220536. Its totient is φ = 15554496.

The previous prime is 21063403. The next prime is 21063451. The reversal of 21063445 is 54436012.

It can be written as a sum of positive squares in 4 ways, for example, as 1340964 + 19722481 = 1158^2 + 4441^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21063445 - 2¹⁵ = 21030677 is a prime.

It is a Duffinian number.

It is a congruent 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 in 7 ways as a sum of consecutive naturals, for example, 161962 + ... + 162091.

It is an arithmetic number, because the mean of its divisors is an integer number (3402567).

Almost surely, 2^21063445 is an apocalyptic number.

It is an amenable number.

21063445 is a deficient number, since it is larger than the sum of its proper divisors (6157091).

21063445 is a wasteful number, since it uses less digits than its factorization.

21063445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324071.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 21063445 is about 4589.4928913770. The cubic root of 21063445 is about 276.1699794846.

Adding to 21063445 its reverse (54436012), we get a palindrome (75499457).

The spelling of 21063445 in words is "twenty-one million, sixty-three thousand, four hundred forty-five".