21314506 has 8 divisors (see below), whose sum is σ = 32751684. Its totient is φ = 10397280.

The previous prime is 21314497. The next prime is 21314543. The reversal of 21314506 is 60541312.

It can be written as a sum of positive squares in 2 ways, for example, as 13140625 + 8173881 = 3625^2 + 2859^2 .

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

It is a zygodrome in base 3.

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, 129885 + ... + 130048.

Almost surely, 2^21314506 is an apocalyptic number.

21314506 is a deficient number, since it is larger than the sum of its proper divisors (11437178).

21314506 is a wasteful number, since it uses less digits than its factorization.

21314506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259976.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 21314506 is about 4616.7635850236. The cubic root of 21314506 is about 277.2628973281.

Adding to 21314506 its reverse (60541312), we get a palindrome (81855818).

The spelling of 21314506 in words is "twenty-one million, three hundred fourteen thousand, five hundred six".