21420214 has 8 divisors (see below), whose sum is σ = 32310360. Its totient is φ = 10650096.

The previous prime is 21420209. The next prime is 21420227. The reversal of 21420214 is 41202412.

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, 29559 + ... + 30274.

It is an arithmetic number, because the mean of its divisors is an integer number (4038795).

Almost surely, 2^21420214 is an apocalyptic number.

21420214 is a deficient number, since it is larger than the sum of its proper divisors (10890146).

21420214 is a wasteful number, since it uses less digits than its factorization.

21420214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60014.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 21420214 is about 4628.1977053708. The cubic root of 21420214 is about 277.7204978544.

Adding to 21420214 its reverse (41202412), we get a palindrome (62622626).

The spelling of 21420214 in words is "twenty-one million, four hundred twenty thousand, two hundred fourteen".