21789948 has 24 divisors (see below), whose sum is σ = 50928640. Its totient is φ = 7251120.

The previous prime is 21789919. The next prime is 21789967. The reversal of 21789948 is 84998712.

It is a junction number, because it is equal to n+sod(n) for n = 21789897 and 21789906.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8613 + ... + 10851.

Almost surely, 2^21789948 is an apocalyptic number.

It is an amenable number.

21789948 is an abundant number, since it is smaller than the sum of its proper divisors (29138692).

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

21789948 is a wasteful number, since it uses less digits than its factorization.

21789948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3057 (or 3055 counting only the distinct ones).

The product of its digits is 290304, while the sum is 48.

The square root of 21789948 is about 4667.9704369244. The cubic root of 21789948 is about 279.3093009984.

The spelling of 21789948 in words is "twenty-one million, seven hundred eighty-nine thousand, nine hundred forty-eight".