21150789 has 8 divisors (see below), whose sum is σ = 30764832. Its totient is φ = 12818640.

The previous prime is 21150757. The next prime is 21150803. The reversal of 21150789 is 98705112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21150789 - 2⁵ = 21150757 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 640933 = 21150789 / (2 + 1 + 1 + 5 + 0 + 7 + 8 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21150709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320434 + ... + 320499.

It is an arithmetic number, because the mean of its divisors is an integer number (3845604).

Almost surely, 2^21150789 is an apocalyptic number.

It is an amenable number.

21150789 is a deficient number, since it is larger than the sum of its proper divisors (9614043).

21150789 is a wasteful number, since it uses less digits than its factorization.

21150789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640947.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 21150789 is about 4598.9986953684. The cubic root of 21150789 is about 276.5511853330.

The spelling of 21150789 in words is "twenty-one million, one hundred fifty thousand, seven hundred eighty-nine".