21359147 has 4 divisors (see below), whose sum is σ = 21548280. Its totient is φ = 21170016.

The previous prime is 21359141. The next prime is 21359153. The reversal of 21359147 is 74195312.

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

It is an interprime number because it is at equal distance from previous prime (21359141) and next prime (21359153).

It is a cyclic number.

It is not a de Polignac number, because 21359147 - 2⁶ = 21359083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21359141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94397 + ... + 94622.

It is an arithmetic number, because the mean of its divisors is an integer number (5387070).

Almost surely, 2^21359147 is an apocalyptic number.

21359147 is a deficient number, since it is larger than the sum of its proper divisors (189133).

21359147 is a wasteful number, since it uses less digits than its factorization.

21359147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189132.

The product of its digits is 7560, while the sum is 32.

The square root of 21359147 is about 4621.5957200950. The cubic root of 21359147 is about 277.4563283817.

The spelling of 21359147 in words is "twenty-one million, three hundred fifty-nine thousand, one hundred forty-seven".