21346306 has 4 divisors (see below), whose sum is σ = 32019462. Its totient is φ = 10673152.

The previous prime is 21346301. The next prime is 21346307. The reversal of 21346306 is 60364312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20169081 + 1177225 = 4491^2 + 1085^2 .

It is not an unprimeable number, because it can be changed into a prime (21346301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5336575 + ... + 5336578.

Almost surely, 2^21346306 is an apocalyptic number.

21346306 is a deficient number, since it is larger than the sum of its proper divisors (10673156).

21346306 is a wasteful number, since it uses less digits than its factorization.

21346306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10673155.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 21346306 is about 4620.2062724515. The cubic root of 21346306 is about 277.4007155033.

The spelling of 21346306 in words is "twenty-one million, three hundred forty-six thousand, three hundred six".