21146063 has 4 divisors (see below), whose sum is σ = 21234048. Its totient is φ = 21058080.

The previous prime is 21146057. The next prime is 21146101. The reversal of 21146063 is 36064112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21146063 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 (21146023) 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, 43631 + ... + 44112.

It is an arithmetic number, because the mean of its divisors is an integer number (5308512).

Almost surely, 2^21146063 is an apocalyptic number.

21146063 is a deficient number, since it is larger than the sum of its proper divisors (87985).

21146063 is an equidigital number, since it uses as much as digits as its factorization.

21146063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87984.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 21146063 is about 4598.4848591683. The cubic root of 21146063 is about 276.5305859713.

The spelling of 21146063 in words is "twenty-one million, one hundred forty-six thousand, sixty-three".