21244179 has 32 divisors (see below), whose sum is σ = 32219136. Its totient is φ = 12337920.

The previous prime is 21244177. The next prime is 21244187. The reversal of 21244179 is 97144212.

It is not a de Polignac number, because 21244179 - 2¹ = 21244177 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21244177) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 154999 + ... + 155135.

It is an arithmetic number, because the mean of its divisors is an integer number (1006848).

Almost surely, 2^21244179 is an apocalyptic number.

21244179 is a deficient number, since it is larger than the sum of its proper divisors (10974957).

21244179 is a wasteful number, since it uses less digits than its factorization.

21244179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315.

The product of its digits is 4032, while the sum is 30.

The square root of 21244179 is about 4609.1408093049. The cubic root of 21244179 is about 276.9576192726.

The spelling of 21244179 in words is "twenty-one million, two hundred forty-four thousand, one hundred seventy-nine".