21048236 has 24 divisors (see below), whose sum is σ = 40739664. Its totient is φ = 9434880.

The previous prime is 21048221. The next prime is 21048239. The reversal of 21048236 is 63284012.

It is not an unprimeable number, because it can be changed into a prime (21048239) 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, 65 + ... + 6488.

It is an arithmetic number, because the mean of its divisors is an integer number (1697486).

Almost surely, 2^21048236 is an apocalyptic number.

It is an amenable number.

21048236 is a deficient number, since it is larger than the sum of its proper divisors (19691428).

21048236 is a wasteful number, since it uses less digits than its factorization.

21048236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6641 (or 6639 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 21048236 is about 4587.8356552954. The cubic root of 21048236 is about 276.1034933587.

The spelling of 21048236 in words is "twenty-one million, forty-eight thousand, two hundred thirty-six".