21339546 has 16 divisors (see below), whose sum is σ = 44925600. Its totient is φ = 6738768.

The previous prime is 21339529. The next prime is 21339553. The reversal of 21339546 is 64593312.

It is a super-2 number, since 2×21339546² = 910752446972232, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93481 + ... + 93708.

It is an arithmetic number, because the mean of its divisors is an integer number (2807850).

Almost surely, 2^21339546 is an apocalyptic number.

21339546 is an abundant number, since it is smaller than the sum of its proper divisors (23586054).

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

21339546 is a wasteful number, since it uses less digits than its factorization.

21339546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187213.

The product of its digits is 19440, while the sum is 33.

The square root of 21339546 is about 4619.4746454548. The cubic root of 21339546 is about 277.3714297677.

The spelling of 21339546 in words is "twenty-one million, three hundred thirty-nine thousand, five hundred forty-six".