21339042 has 8 divisors (see below), whose sum is σ = 42678096. Its totient is φ = 7113012.

The previous prime is 21339037. The next prime is 21339053. The reversal of 21339042 is 24093312.

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

21339042 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, 1778248 + ... + 1778259.

It is an arithmetic number, because the mean of its divisors is an integer number (5334762).

Almost surely, 2^21339042 is an apocalyptic number.

21339042 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.

21339042 is a wasteful number, since it uses less digits than its factorization.

21339042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3556512.

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 21339042 is about 4619.4200934749. The cubic root of 21339042 is about 277.3692460864.

It can be divided in two parts, 2133 and 9042, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 21339042 in words is "twenty-one million, three hundred thirty-nine thousand, forty-two".