21148548 has 24 divisors (see below), whose sum is σ = 49738752. Its totient is φ = 6993504.

The previous prime is 21148529. The next prime is 21148549. The reversal of 21148548 is 84584112.

It is a super-2 number, since 2×21148548² = 894522165016608, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21148549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5415 + ... + 8462.

It is an arithmetic number, because the mean of its divisors is an integer number (2072448).

Almost surely, 2^21148548 is an apocalyptic number.

It is an amenable number.

21148548 is an abundant number, since it is smaller than the sum of its proper divisors (28590204).

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

21148548 is a wasteful number, since it uses less digits than its factorization.

21148548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14011 (or 14009 counting only the distinct ones).

The product of its digits is 10240, while the sum is 33.

The square root of 21148548 is about 4598.7550489236. The cubic root of 21148548 is about 276.5414177999.

The spelling of 21148548 in words is "twenty-one million, one hundred forty-eight thousand, five hundred forty-eight".