21139606 has 8 divisors (see below), whose sum is σ = 31782960. Its totient is φ = 10545288.

The previous prime is 21139597. The next prime is 21139621. The reversal of 21139606 is 60693112.

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

It is a congruent 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, 11161 + ... + 12916.

It is an arithmetic number, because the mean of its divisors is an integer number (3972870).

Almost surely, 2^21139606 is an apocalyptic number.

21139606 is a deficient number, since it is larger than the sum of its proper divisors (10643354).

21139606 is a wasteful number, since it uses less digits than its factorization.

21139606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24518.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 21139606 is about 4597.7827264889. The cubic root of 21139606 is about 276.5024366847.

The spelling of 21139606 in words is "twenty-one million, one hundred thirty-nine thousand, six hundred six".