21346312 has 16 divisors (see below), whose sum is σ = 43103340. Its totient is φ = 9852096.

The previous prime is 21346309. The next prime is 21346313. The reversal of 21346312 is 21364312.

It can be written as a sum of positive squares in 2 ways, for example, as 18610596 + 2735716 = 4314^2 + 1654^2 .

It is not an unprimeable number, because it can be changed into a prime (21346313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 102523 + ... + 102730.

Almost surely, 2^21346312 is an apocalyptic number.

It is an amenable number.

21346312 is an abundant number, since it is smaller than the sum of its proper divisors (21757028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21346312 is a wasteful number, since it uses less digits than its factorization.

21346312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205272 (or 205268 counting only the distinct ones).

The product of its digits is 864, while the sum is 22.

The square root of 21346312 is about 4620.2069217731. The cubic root of 21346312 is about 277.4007414938.

The spelling of 21346312 in words is "twenty-one million, three hundred forty-six thousand, three hundred twelve".