21416930 has 8 divisors (see below), whose sum is σ = 38550492. Its totient is φ = 8566768.

The previous prime is 21416909. The next prime is 21416953. The reversal of 21416930 is 3961412.

It can be written as a sum of positive squares in 2 ways, for example, as 20187049 + 1229881 = 4493^2 + 1109^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21416930.

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, 1070837 + ... + 1070856.

Almost surely, 2^21416930 is an apocalyptic number.

21416930 is a deficient number, since it is larger than the sum of its proper divisors (17133562).

21416930 is a wasteful number, since it uses less digits than its factorization.

21416930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2141700.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 21416930 is about 4627.8429100392. The cubic root of 21416930 is about 277.7063043964.

The spelling of 21416930 in words is "twenty-one million, four hundred sixteen thousand, nine hundred thirty".