21793078 has 4 divisors (see below), whose sum is σ = 32689620. Its totient is φ = 10896538.

The previous prime is 21793069. The next prime is 21793091. The reversal of 21793078 is 87039712.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 5448268 + ... + 5448271.

It is an arithmetic number, because the mean of its divisors is an integer number (8172405).

Almost surely, 2^21793078 is an apocalyptic number.

21793078 is a deficient number, since it is larger than the sum of its proper divisors (10896542).

21793078 is a wasteful number, since it uses less digits than its factorization.

21793078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10896541.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 21793078 is about 4668.3056883627. The cubic root of 21793078 is about 279.3226740799.

The spelling of 21793078 in words is "twenty-one million, seven hundred ninety-three thousand, seventy-eight".