21088339 has 12 divisors (see below), whose sum is σ = 22249920. Its totient is φ = 19964880.

The previous prime is 21088337. The next prime is 21088343. The reversal of 21088339 is 93388012.

It is not a de Polignac number, because 21088339 - 2¹ = 21088337 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21088337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 193417 + ... + 193525.

It is an arithmetic number, because the mean of its divisors is an integer number (1854160).

Almost surely, 2^21088339 is an apocalyptic number.

21088339 is a deficient number, since it is larger than the sum of its proper divisors (1161581).

21088339 is an equidigital number, since it uses as much as digits as its factorization.

21088339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 21088339 is about 4592.2041548694. The cubic root of 21088339 is about 276.2787345471.

The spelling of 21088339 in words is "twenty-one million, eighty-eight thousand, three hundred thirty-nine".