21196239 has 4 divisors (see below), whose sum is σ = 28261656. Its totient is φ = 14130824.

The previous prime is 21196223. The next prime is 21196261. The reversal of 21196239 is 93269112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21196239 - 2⁴ = 21196223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21196939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3532704 + ... + 3532709.

It is an arithmetic number, because the mean of its divisors is an integer number (7065414).

Almost surely, 2^21196239 is an apocalyptic number.

21196239 is a deficient number, since it is larger than the sum of its proper divisors (7065417).

21196239 is an equidigital number, since it uses as much as digits as its factorization.

21196239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7065416.

The product of its digits is 5832, while the sum is 33.

The square root of 21196239 is about 4603.9373366717. The cubic root of 21196239 is about 276.7491331721.

The spelling of 21196239 in words is "twenty-one million, one hundred ninety-six thousand, two hundred thirty-nine".