21879322 has 8 divisors (see below), whose sum is σ = 33619572. Its totient is φ = 10672800.

The previous prime is 21879313. The next prime is 21879329. The reversal of 21879322 is 22397812.

It can be written as a sum of positive squares in 2 ways, for example, as 20693401 + 1185921 = 4549^2 + 1089^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21879329) 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 3 ways as a sum of consecutive naturals, for example, 133329 + ... + 133492.

Almost surely, 2^21879322 is an apocalyptic number.

21879322 is a deficient number, since it is larger than the sum of its proper divisors (11740250).

21879322 is a wasteful number, since it uses less digits than its factorization.

21879322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266864.

The product of its digits is 12096, while the sum is 34.

The square root of 21879322 is about 4677.5337518825. The cubic root of 21879322 is about 279.6906532545.

It can be divided in two parts, 21879 and 322, that added together give a square (22201 = 149²).

The spelling of 21879322 in words is "twenty-one million, eight hundred seventy-nine thousand, three hundred twenty-two".