21699948 has 24 divisors (see below), whose sum is σ = 52835328. Its totient is φ = 6918736.

The previous prime is 21699901. The next prime is 21700001. The reversal of 21699948 is 84999612.

It is a junction number, because it is equal to n+sod(n) for n = 21699897 and 21699906.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39036 + ... + 39587.

It is an arithmetic number, because the mean of its divisors is an integer number (2201472).

Almost surely, 2^21699948 is an apocalyptic number.

It is an amenable number.

21699948 is an abundant number, since it is smaller than the sum of its proper divisors (31135380).

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

21699948 is a wasteful number, since it uses less digits than its factorization.

21699948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78653 (or 78651 counting only the distinct ones).

The product of its digits is 279936, while the sum is 48.

The square root of 21699948 is about 4658.3202981332. The cubic root of 21699948 is about 278.9242224285.

The spelling of 21699948 in words is "twenty-one million, six hundred ninety-nine thousand, nine hundred forty-eight".