21677206 has 8 divisors (see below), whose sum is σ = 32586840. Its totient is φ = 10814928.

The previous prime is 21677177. The next prime is 21677213. The reversal of 21677206 is 60277612.

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 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, 10671 + ... + 12538.

It is an arithmetic number, because the mean of its divisors is an integer number (4073355).

Almost surely, 2^21677206 is an apocalyptic number.

21677206 is a deficient number, since it is larger than the sum of its proper divisors (10909634).

21677206 is a wasteful number, since it uses less digits than its factorization.

21677206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23678.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 21677206 is about 4655.8786496214. The cubic root of 21677206 is about 278.8267488935.

The spelling of 21677206 in words is "twenty-one million, six hundred seventy-seven thousand, two hundred six".