21975214 has 8 divisors (see below), whose sum is σ = 34099560. Its totient is φ = 10608696.

The previous prime is 21975167. The next prime is 21975287. The reversal of 21975214 is 41257912.

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, 189384 + ... + 189499.

It is an arithmetic number, because the mean of its divisors is an integer number (4262445).

Almost surely, 2^21975214 is an apocalyptic number.

21975214 is a deficient number, since it is larger than the sum of its proper divisors (12124346).

21975214 is a wasteful number, since it uses less digits than its factorization.

21975214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378914.

The product of its digits is 5040, while the sum is 31.

The square root of 21975214 is about 4687.7728187275. The cubic root of 21975214 is about 280.0986642090.

The spelling of 21975214 in words is "twenty-one million, nine hundred seventy-five thousand, two hundred fourteen".