21386948 has 24 divisors (see below), whose sum is σ = 41258784. Its totient is φ = 9619200.

The previous prime is 21386947. The next prime is 21386971. The reversal of 21386948 is 84968312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21386947) 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, 1763 + ... + 6773.

It is an arithmetic number, because the mean of its divisors is an integer number (1719116).

Almost surely, 2^21386948 is an apocalyptic number.

It is an amenable number.

21386948 is a deficient number, since it is larger than the sum of its proper divisors (19871836).

21386948 is a wasteful number, since it uses less digits than its factorization.

21386948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5123 (or 5121 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 21386948 is about 4624.6024694021. The cubic root of 21386948 is about 277.5766549589.

The spelling of 21386948 in words is "twenty-one million, three hundred eighty-six thousand, nine hundred forty-eight".