21144495 has 8 divisors (see below), whose sum is σ = 33831216. Its totient is φ = 11277056.

The previous prime is 21144469. The next prime is 21144547. The reversal of 21144495 is 59444112.

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 21144495 - 2¹¹ = 21142447 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 704802 + ... + 704831.

It is an arithmetic number, because the mean of its divisors is an integer number (4228902).

Almost surely, 2^21144495 is an apocalyptic number.

21144495 is a deficient number, since it is larger than the sum of its proper divisors (12686721).

21144495 is a wasteful number, since it uses less digits than its factorization.

21144495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1409641.

The product of its digits is 5760, while the sum is 30.

The square root of 21144495 is about 4598.3143650690. The cubic root of 21144495 is about 276.5237508033.

The spelling of 21144495 in words is "twenty-one million, one hundred forty-four thousand, four hundred ninety-five".