21115214 has 8 divisors (see below), whose sum is σ = 31705128. Its totient is φ = 10546840.

The previous prime is 21115189. The next prime is 21115229. The reversal of 21115214 is 41251112.

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 = 21115192 and 21115201.

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, 2657 + ... + 7020.

It is an arithmetic number, because the mean of its divisors is an integer number (3963141).

Almost surely, 2^21115214 is an apocalyptic number.

21115214 is a deficient number, since it is larger than the sum of its proper divisors (10589914).

21115214 is a wasteful number, since it uses less digits than its factorization.

21115214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10770.

The product of its digits is 80, while the sum is 17.

The square root of 21115214 is about 4595.1293779392. The cubic root of 21115214 is about 276.3960480236.

Adding to 21115214 its reverse (41251112), we get a palindrome (62366326).

The spelling of 21115214 in words is "twenty-one million, one hundred fifteen thousand, two hundred fourteen".