21163489 has 4 divisors (see below), whose sum is σ = 21613824. Its totient is φ = 20713156.

The previous prime is 21163481. The next prime is 21163507. The reversal of 21163489 is 98436112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21163489 - 2³ = 21163481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21163481) 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, 225097 + ... + 225190.

It is an arithmetic number, because the mean of its divisors is an integer number (5403456).

Almost surely, 2^21163489 is an apocalyptic number.

It is an amenable number.

21163489 is a deficient number, since it is larger than the sum of its proper divisors (450335).

21163489 is an equidigital number, since it uses as much as digits as its factorization.

21163489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450334.

The product of its digits is 10368, while the sum is 34.

The square root of 21163489 is about 4600.3792234989. The cubic root of 21163489 is about 276.6065260159.

The spelling of 21163489 in words is "twenty-one million, one hundred sixty-three thousand, four hundred eighty-nine".