21256548 has 48 divisors (see below), whose sum is σ = 51246720. Its totient is φ = 6854400.

The previous prime is 21256541. The next prime is 21256559. The reversal of 21256548 is 84565212.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21256541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51768 + ... + 52176.

It is an arithmetic number, because the mean of its divisors is an integer number (1067640).

Almost surely, 2^21256548 is an apocalyptic number.

It is an amenable number.

21256548 is an abundant number, since it is smaller than the sum of its proper divisors (29990172).

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

21256548 is a wasteful number, since it uses less digits than its factorization.

21256548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548 (or 546 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 21256548 is about 4610.4824042610. The cubic root of 21256548 is about 277.0113598629.

The spelling of 21256548 in words is "twenty-one million, two hundred fifty-six thousand, five hundred forty-eight".