21789050 has 24 divisors (see below), whose sum is σ = 42291936. Its totient is φ = 8336240.

The previous prime is 21789043. The next prime is 21789071. The reversal of 21789050 is 5098712.

It is a zygodrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 21788998 and 21789016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8324 + ... + 10623.

It is an arithmetic number, because the mean of its divisors is an integer number (1762164).

Almost surely, 2^21789050 is an apocalyptic number.

21789050 is a deficient number, since it is larger than the sum of its proper divisors (20502886).

21789050 is a wasteful number, since it uses less digits than its factorization.

21789050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18982 (or 18977 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 32.

The square root of 21789050 is about 4667.8742485204. The cubic root of 21789050 is about 279.3054640120.

The spelling of 21789050 in words is "twenty-one million, seven hundred eighty-nine thousand, fifty".