21342297 has 8 divisors (see below), whose sum is σ = 28516320. Its totient is φ = 14198240.

The previous prime is 21342287. The next prime is 21342311. The reversal of 21342297 is 79224312.

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

It is a cyclic number.

It is not a de Polignac number, because 21342297 - 2⁴ = 21342281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21342227) 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, 5772 + ... + 8717.

It is an arithmetic number, because the mean of its divisors is an integer number (3564540).

Almost surely, 2^21342297 is an apocalyptic number.

It is an amenable number.

21342297 is a deficient number, since it is larger than the sum of its proper divisors (7174023).

21342297 is a wasteful number, since it uses less digits than its factorization.

21342297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14983.

The product of its digits is 6048, while the sum is 30.

The square root of 21342297 is about 4619.7723969910. The cubic root of 21342297 is about 277.3833484220.

The spelling of 21342297 in words is "twenty-one million, three hundred forty-two thousand, two hundred ninety-seven".