21224895 has 8 divisors (see below), whose sum is σ = 33959856. Its totient is φ = 11319936.

The previous prime is 21224893. The next prime is 21224899. The reversal of 21224895 is 59842212.

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

It is not a de Polignac number, because 21224895 - 2¹ = 21224893 is a prime.

It is a super-2 number, since 2×21224895² = 900992335522050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707482 + ... + 707511.

It is an arithmetic number, because the mean of its divisors is an integer number (4244982).

Almost surely, 2^21224895 is an apocalyptic number.

21224895 is a deficient number, since it is larger than the sum of its proper divisors (12734961).

21224895 is a wasteful number, since it uses less digits than its factorization.

21224895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415001.

The product of its digits is 11520, while the sum is 33.

The square root of 21224895 is about 4607.0484043474. The cubic root of 21224895 is about 276.8737928973.

The spelling of 21224895 in words is "twenty-one million, two hundred twenty-four thousand, eight hundred ninety-five".