21673078 has 16 divisors (see below), whose sum is σ = 37856160. Its totient is φ = 9112896.

The previous prime is 21673073. The next prime is 21673103. The reversal of 21673078 is 87037612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21673073) 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, 13863 + ... + 15346.

It is an arithmetic number, because the mean of its divisors is an integer number (2366010).

Almost surely, 2^21673078 is an apocalyptic number.

21673078 is a deficient number, since it is larger than the sum of its proper divisors (16183082).

21673078 is a wasteful number, since it uses less digits than its factorization.

21673078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29271.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 21673078 is about 4655.4353179912. The cubic root of 21673078 is about 278.8090487359.

The spelling of 21673078 in words is "twenty-one million, six hundred seventy-three thousand, seventy-eight".