21678362 has 16 divisors (see below), whose sum is σ = 33702912. Its totient is φ = 10446960.

The previous prime is 21678361. The next prime is 21678379. The reversal of 21678362 is 26387612.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21678361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19103 + ... + 20205.

It is an arithmetic number, because the mean of its divisors is an integer number (2106432).

Almost surely, 2^21678362 is an apocalyptic number.

21678362 is a deficient number, since it is larger than the sum of its proper divisors (12024550).

21678362 is a wasteful number, since it uses less digits than its factorization.

21678362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1453.

The product of its digits is 24192, while the sum is 35.

The square root of 21678362 is about 4656.0027920954. The cubic root of 21678362 is about 278.8317052209.

The spelling of 21678362 in words is "twenty-one million, six hundred seventy-eight thousand, three hundred sixty-two".