21220179 has 8 divisors (see below), whose sum is σ = 28354560. Its totient is φ = 14116296.

The previous prime is 21220159. The next prime is 21220211. The reversal of 21220179 is 97102212.

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

It is not a de Polignac number, because 21220179 - 2¹⁹ = 20695891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21220109) by changing a digit.

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, 5947 + ... + 8820.

It is an arithmetic number, because the mean of its divisors is an integer number (3544320).

Almost surely, 2^21220179 is an apocalyptic number.

21220179 is a deficient number, since it is larger than the sum of its proper divisors (7134381).

21220179 is a wasteful number, since it uses less digits than its factorization.

21220179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15249.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 21220179 is about 4606.5365514668. The cubic root of 21220179 is about 276.8532850059.

The spelling of 21220179 in words is "twenty-one million, two hundred twenty thousand, one hundred seventy-nine".