21169244 has 12 divisors (see below), whose sum is σ = 37908024. Its totient is φ = 10338384.

The previous prime is 21169241. The next prime is 21169261. The reversal of 21169244 is 44296112.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21169241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61367 + ... + 61710.

It is an arithmetic number, because the mean of its divisors is an integer number (3159002).

Almost surely, 2^21169244 is an apocalyptic number.

It is an amenable number.

21169244 is a deficient number, since it is larger than the sum of its proper divisors (16738780).

21169244 is a wasteful number, since it uses less digits than its factorization.

21169244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123124 (or 123122 counting only the distinct ones).

The product of its digits is 3456, while the sum is 29.

The square root of 21169244 is about 4601.0046728948. The cubic root of 21169244 is about 276.6315963353.

The spelling of 21169244 in words is "twenty-one million, one hundred sixty-nine thousand, two hundred forty-four".