21339248 has 20 divisors (see below), whose sum is σ = 47251440. Its totient is φ = 9145344.

The previous prime is 21339247. The next prime is 21339277. The reversal of 21339248 is 84293312.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95153 + ... + 95376.

It is an arithmetic number, because the mean of its divisors is an integer number (2362572).

Almost surely, 2^21339248 is an apocalyptic number.

21339248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21339248 is an abundant number, since it is smaller than the sum of its proper divisors (25912192).

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

21339248 is a wasteful number, since it uses less digits than its factorization.

21339248 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190544 (or 190538 counting only the distinct ones).

The product of its digits is 10368, while the sum is 32.

The square root of 21339248 is about 4619.4423905922. The cubic root of 21339248 is about 277.3701386270.

The spelling of 21339248 in words is "twenty-one million, three hundred thirty-nine thousand, two hundred forty-eight".