21353163 has 16 divisors (see below), whose sum is σ = 30858240. Its totient is φ = 13055904.

The previous prime is 21353159. The next prime is 21353191. The reversal of 21353163 is 36135312.

It is a happy number.

It is not a de Polignac number, because 21353163 - 2² = 21353159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21353153) 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 15 ways as a sum of consecutive naturals, for example, 4678 + ... + 8036.

It is an arithmetic number, because the mean of its divisors is an integer number (1928640).

Almost surely, 2^21353163 is an apocalyptic number.

21353163 is a deficient number, since it is larger than the sum of its proper divisors (9505077).

21353163 is a wasteful number, since it uses less digits than its factorization.

21353163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3538.

The product of its digits is 1620, while the sum is 24.

The square root of 21353163 is about 4620.9482793037. The cubic root of 21353163 is about 277.4304151474.

Adding to 21353163 its reverse (36135312), we get a palindrome (57488475).

The spelling of 21353163 in words is "twenty-one million, three hundred fifty-three thousand, one hundred sixty-three".