21180214 has 8 divisors (see below), whose sum is σ = 34658568. Its totient is φ = 9627360.

The previous prime is 21180197. The next prime is 21180227. The reversal of 21180214 is 41208112.

It is a happy number.

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

It is a junction number, because it is equal to n+sod(n) for n = 21180191 and 21180200.

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, 481347 + ... + 481390.

It is an arithmetic number, because the mean of its divisors is an integer number (4332321).

Almost surely, 2^21180214 is an apocalyptic number.

21180214 is a deficient number, since it is larger than the sum of its proper divisors (13478354).

21180214 is a wasteful number, since it uses less digits than its factorization.

21180214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 962750.

The product of its (nonzero) digits is 128, while the sum is 19.

The square root of 21180214 is about 4602.1966494273. The cubic root of 21180214 is about 276.6793720073.

Adding to 21180214 its reverse (41208112), we get a palindrome (62388326).

The spelling of 21180214 in words is "twenty-one million, one hundred eighty thousand, two hundred fourteen".