21539082 has 8 divisors (see below), whose sum is σ = 43078176. Its totient is φ = 7179692.

The previous prime is 21539059. The next prime is 21539101. The reversal of 21539082 is 28093512.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

21539082 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1794918 + ... + 1794929.

It is an arithmetic number, because the mean of its divisors is an integer number (5384772).

Almost surely, 2^21539082 is an apocalyptic number.

21539082 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21539082 is a wasteful number, since it uses less digits than its factorization.

21539082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3589852.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 21539082 is about 4641.0216547653. The cubic root of 21539082 is about 278.2332721066.

The spelling of 21539082 in words is "twenty-one million, five hundred thirty-nine thousand, eighty-two".