21163006 has 12 divisors (see below), whose sum is σ = 32363352. Its totient is φ = 10379096.

The previous prime is 21163003. The next prime is 21163033. The reversal of 21163006 is 60036112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21163003) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3735 + ... + 7501.

It is an arithmetic number, because the mean of its divisors is an integer number (2696946).

Almost surely, 2^21163006 is an apocalyptic number.

21163006 is a deficient number, since it is larger than the sum of its proper divisors (11200346).

21163006 is an equidigital number, since it uses as much as digits as its factorization.

21163006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3875 (or 3822 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 21163006 is about 4600.3267275271. The cubic root of 21163006 is about 276.6044217320.

Adding to 21163006 its reverse (60036112), we get a palindrome (81199118).

The spelling of 21163006 in words is "twenty-one million, one hundred sixty-three thousand, six".