21768322 has 8 divisors (see below), whose sum is σ = 32771196. Its totient is φ = 10844592.

The previous prime is 21768289. The next prime is 21768323. The reversal of 21768322 is 22386712.

It can be written as a sum of positive squares in 2 ways, for example, as 21538881 + 229441 = 4641^2 + 479^2 .

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 (21768323) 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, 19093 + ... + 20200.

Almost surely, 2^21768322 is an apocalyptic number.

21768322 is a deficient number, since it is larger than the sum of its proper divisors (11002874).

21768322 is a wasteful number, since it uses less digits than its factorization.

21768322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39572.

The product of its digits is 8064, while the sum is 31.

The square root of 21768322 is about 4665.6534376226. The cubic root of 21768322 is about 279.2168678216.

The spelling of 21768322 in words is "twenty-one million, seven hundred sixty-eight thousand, three hundred twenty-two".