21144607 has 8 divisors (see below), whose sum is σ = 23110272. Its totient is φ = 19186200.

The previous prime is 21144593. The next prime is 21144619. The reversal of 21144607 is 70644112.

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

It is not a de Polignac number, because 21144607 - 2¹⁹ = 20620319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144677) by changing a digit.

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, 5632 + ... + 8602.

It is an arithmetic number, because the mean of its divisors is an integer number (2888784).

Almost surely, 2^21144607 is an apocalyptic number.

21144607 is a deficient number, since it is larger than the sum of its proper divisors (1965665).

21144607 is a wasteful number, since it uses less digits than its factorization.

21144607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3629.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 21144607 is about 4598.3265434286. The cubic root of 21144607 is about 276.5242390408.

Adding to 21144607 its reverse (70644112), we get a palindrome (91788719).

The spelling of 21144607 in words is "twenty-one million, one hundred forty-four thousand, six hundred seven".