21214078 has 8 divisors (see below), whose sum is σ = 31883760. Its totient is φ = 10586160.

The previous prime is 21214049. The next prime is 21214087. The reversal of 21214078 is 87041212.

It is a happy number.

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, 9138 + ... + 11221.

It is an arithmetic number, because the mean of its divisors is an integer number (3985470).

Almost surely, 2^21214078 is an apocalyptic number.

21214078 is a deficient number, since it is larger than the sum of its proper divisors (10669682).

21214078 is a wasteful number, since it uses less digits than its factorization.

21214078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20882.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 21214078 is about 4605.8742926832. The cubic root of 21214078 is about 276.8267498261.

The spelling of 21214078 in words is "twenty-one million, two hundred fourteen thousand, seventy-eight".