21342207 has 8 divisors (see below), whose sum is σ = 28846384. Its totient is φ = 14033088.

The previous prime is 21342203. The next prime is 21342221. The reversal of 21342207 is 70224312.

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

It is not a de Polignac number, because 21342207 - 2² = 21342203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21342203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48508 + ... + 48945.

It is an arithmetic number, because the mean of its divisors is an integer number (3605798).

Almost surely, 2^21342207 is an apocalyptic number.

21342207 is a deficient number, since it is larger than the sum of its proper divisors (7504177).

21342207 is an equidigital number, since it uses as much as digits as its factorization.

21342207 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97529.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21342207 is about 4619.7626562411. The cubic root of 21342207 is about 277.3829585150.

Adding to 21342207 its reverse (70224312), we get a palindrome (91566519).

The spelling of 21342207 in words is "twenty-one million, three hundred forty-two thousand, two hundred seven".