21177214 has 8 divisors (see below), whose sum is σ = 32168160. Its totient is φ = 10454496.

The previous prime is 21177139. The next prime is 21177239. The reversal of 21177214 is 41277112.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66859 + ... + 67174.

It is an arithmetic number, because the mean of its divisors is an integer number (4021020).

Almost surely, 2^21177214 is an apocalyptic number.

21177214 is a deficient number, since it is larger than the sum of its proper divisors (10990946).

21177214 is a wasteful number, since it uses less digits than its factorization.

21177214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134114.

The product of its digits is 784, while the sum is 25.

The square root of 21177214 is about 4601.8707065714. The cubic root of 21177214 is about 276.6663082849. Note that the first 3 decimals are identical.

The spelling of 21177214 in words is "twenty-one million, one hundred seventy-seven thousand, two hundred fourteen".