21682948 has 24 divisors (see below), whose sum is σ = 43464512. Its totient is φ = 9271584.

The previous prime is 21682937. The next prime is 21682963. The reversal of 21682948 is 84928612.

It is a self number, because there is not a number n which added to its sum of digits gives 21682948.

It is an unprimeable number.

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, 24115 + ... + 24997.

Almost surely, 2^21682948 is an apocalyptic number.

21682948 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21682948 is an abundant number, since it is smaller than the sum of its proper divisors (21781564).

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

21682948 is a wasteful number, since it uses less digits than its factorization.

21682948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771 (or 1769 counting only the distinct ones).

The product of its digits is 55296, while the sum is 40.

The square root of 21682948 is about 4656.4952485748. The cubic root of 21682948 is about 278.8513658706.

The spelling of 21682948 in words is "twenty-one million, six hundred eighty-two thousand, nine hundred forty-eight".