21455948 has 12 divisors (see below), whose sum is σ = 37649640. Its totient is φ = 10698912.

The previous prime is 21455947. The next prime is 21455953. The reversal of 21455948 is 84955412.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21455947) 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 3 ways as a sum of consecutive naturals, for example, 5561 + ... + 8592.

It is an arithmetic number, because the mean of its divisors is an integer number (3137470).

Almost surely, 2^21455948 is an apocalyptic number.

It is an amenable number.

21455948 is a deficient number, since it is larger than the sum of its proper divisors (16193692).

21455948 is a wasteful number, since it uses less digits than its factorization.

21455948 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14536 (or 14534 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 21455948 is about 4632.0565626944. The cubic root of 21455948 is about 277.8748466207.

The spelling of 21455948 in words is "twenty-one million, four hundred fifty-five thousand, nine hundred forty-eight".