21299382 has 32 divisors (see below), whose sum is σ = 50974560. Its totient is φ = 6553440.

The previous prime is 21299381. The next prime is 21299393. The reversal of 21299382 is 28399212.

21299382 = 1274² + 1275² + ... + 1286².

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21299381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14469 + ... + 15872.

It is an arithmetic number, because the mean of its divisors is an integer number (1592955).

Almost surely, 2^21299382 is an apocalyptic number.

21299382 is an abundant number, since it is smaller than the sum of its proper divisors (29675178).

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

21299382 is a wasteful number, since it uses less digits than its factorization.

21299382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30365 (or 30359 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 21299382 is about 4615.1253504103. The cubic root of 21299382 is about 277.1973032477.

It can be divided in two parts, 2129 and 9382, that added together give a palindrome (11511).

The spelling of 21299382 in words is "twenty-one million, two hundred ninety-nine thousand, three hundred eighty-two".