21416746 has 8 divisors (see below), whose sum is σ = 34596324. Its totient is φ = 9884640.

The previous prime is 21416737. The next prime is 21416779. The reversal of 21416746 is 64761412.

It can be written as a sum of positive squares in 2 ways, for example, as 20151121 + 1265625 = 4489^2 + 1125^2 .

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

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, 411835 + ... + 411886.

Almost surely, 2^21416746 is an apocalyptic number.

21416746 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21416746 is a deficient number, since it is larger than the sum of its proper divisors (13179578).

21416746 is a wasteful number, since it uses less digits than its factorization.

21416746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823736.

The product of its digits is 8064, while the sum is 31.

The square root of 21416746 is about 4627.8230303243. The cubic root of 21416746 is about 277.7055091049.

The spelling of 21416746 in words is "twenty-one million, four hundred sixteen thousand, seven hundred forty-six".