21768086 has 8 divisors (see below), whose sum is σ = 32729184. Its totient is φ = 10858360.

The previous prime is 21768059. The next prime is 21768101. The reversal of 21768086 is 68086712.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11765 + ... + 13488.

It is an arithmetic number, because the mean of its divisors is an integer number (4091148).

Almost surely, 2^21768086 is an apocalyptic number.

21768086 is a deficient number, since it is larger than the sum of its proper divisors (10961098).

21768086 is a wasteful number, since it uses less digits than its factorization.

21768086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25686.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 21768086 is about 4665.6281463486. The cubic root of 21768086 is about 279.2158587801.

The spelling of 21768086 in words is "twenty-one million, seven hundred sixty-eight thousand, eighty-six".