21343147 has 8 divisors (see below), whose sum is σ = 24484352. Its totient is φ = 18225000.

The previous prime is 21343141. The next prime is 21343151. The reversal of 21343147 is 74134312.

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 21343147 - 2³ = 21343139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21343141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3729 + ... + 7522.

It is an arithmetic number, because the mean of its divisors is an integer number (3060544).

Almost surely, 2^21343147 is an apocalyptic number.

21343147 is a deficient number, since it is larger than the sum of its proper divisors (3141205).

21343147 is a wasteful number, since it uses less digits than its factorization.

21343147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11529.

The product of its digits is 2016, while the sum is 25.

The square root of 21343147 is about 4619.8643919492. The cubic root of 21343147 is about 277.3870308235.

Adding to 21343147 its reverse (74134312), we get a palindrome (95477459).

The spelling of 21343147 in words is "twenty-one million, three hundred forty-three thousand, one hundred forty-seven".