21163000 has 32 divisors (see below), whose sum is σ = 49523760. Its totient is φ = 8464800.

The previous prime is 21162997. The next prime is 21163003. The reversal of 21163000 is 36112.

It is an interprime number because it is at equal distance from previous prime (21162997) and next prime (21163003).

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 7 ways as a sum of consecutive naturals, for example, 9582 + ... + 11581.

Almost surely, 2^21163000 is an apocalyptic number.

21163000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21163000 is an abundant number, since it is smaller than the sum of its proper divisors (28360760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21163000 is a wasteful number, since it uses less digits than its factorization.

21163000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21184 (or 21170 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 21163000 is about 4600.3260753994. The cubic root of 21163000 is about 276.6043955916.

Adding to 21163000 its reverse (36112), we get a palindrome (21199112).

The spelling of 21163000 in words is "twenty-one million, one hundred sixty-three thousand".