21299312 has 10 divisors (see below), whose sum is σ = 41267448. Its totient is φ = 10649648.

The previous prime is 21299303. The next prime is 21299321. The reversal of 21299312 is 21399212.

It is an interprime number because it is at equal distance from previous prime (21299303) and next prime (21299321).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 665588 + ... + 665619.

Almost surely, 2^21299312 is an apocalyptic number.

It is an amenable number.

21299312 is a deficient number, since it is larger than the sum of its proper divisors (19968136).

21299312 is a wasteful number, since it uses less digits than its factorization.

21299312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331215 (or 1331209 counting only the distinct ones).

The product of its digits is 1944, while the sum is 29.

The square root of 21299312 is about 4615.1177666447. The cubic root of 21299312 is about 277.1969995795.

The spelling of 21299312 in words is "twenty-one million, two hundred ninety-nine thousand, three hundred twelve".