21095224 has 16 divisors (see below), whose sum is σ = 39939120. Its totient is φ = 10444800.

The previous prime is 21095201. The next prime is 21095227. The reversal of 21095224 is 42259012.

It is a super-2 number, since 2×21095224² = 890016951220352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21095227) 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 3 ways as a sum of consecutive naturals, for example, 11977 + ... + 13624.

It is an arithmetic number, because the mean of its divisors is an integer number (2496195).

Almost surely, 2^21095224 is an apocalyptic number.

It is an amenable number.

21095224 is a deficient number, since it is larger than the sum of its proper divisors (18843896).

21095224 is a wasteful number, since it uses less digits than its factorization.

21095224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25710 (or 25706 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21095224 is about 4592.9537337099. The cubic root of 21095224 is about 276.3087981147.

The spelling of 21095224 in words is "twenty-one million, ninety-five thousand, two hundred twenty-four".