21439059 has 8 divisors (see below), whose sum is σ = 29828352. Its totient is φ = 13671240.

The previous prime is 21438961. The next prime is 21439079. The reversal of 21439059 is 95093412.

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

It is not a de Polignac number, because 21439059 - 2⁷ = 21438931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21439079) 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 7 ways as a sum of consecutive naturals, for example, 155287 + ... + 155424.

It is an arithmetic number, because the mean of its divisors is an integer number (3728544).

Almost surely, 2^21439059 is an apocalyptic number.

21439059 is a deficient number, since it is larger than the sum of its proper divisors (8389293).

21439059 is a wasteful number, since it uses less digits than its factorization.

21439059 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310737.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 21439059 is about 4630.2331474776. The cubic root of 21439059 is about 277.8019179672.

The spelling of 21439059 in words is "twenty-one million, four hundred thirty-nine thousand, fifty-nine".