21768074 has 8 divisors (see below), whose sum is σ = 34071840. Its totient is φ = 10410796.

The previous prime is 21768059. The next prime is 21768101. The reversal of 21768074 is 47086712.

It is a happy number.

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

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 in 3 ways as a sum of consecutive naturals, for example, 236564 + ... + 236655.

It is an arithmetic number, because the mean of its divisors is an integer number (4258980).

Almost surely, 2^21768074 is an apocalyptic number.

21768074 is a deficient number, since it is larger than the sum of its proper divisors (12303766).

21768074 is a wasteful number, since it uses less digits than its factorization.

21768074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473244.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 21768074 is about 4665.6268603479. The cubic root of 21768074 is about 279.2158074728.

The spelling of 21768074 in words is "twenty-one million, seven hundred sixty-eight thousand, seventy-four".