21400548 has 24 divisors (see below), whose sum is σ = 53776128. Its totient is φ = 6584736.

The previous prime is 21400523. The next prime is 21400583. The reversal of 21400548 is 84500412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68436 + ... + 68747.

It is an arithmetic number, because the mean of its divisors is an integer number (2240672).

Almost surely, 2^21400548 is an apocalyptic number.

It is an amenable number.

21400548 is an abundant number, since it is smaller than the sum of its proper divisors (32375580).

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

21400548 is a wasteful number, since it uses less digits than its factorization.

21400548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137203 (or 137201 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 24.

The square root of 21400548 is about 4626.0726323740. The cubic root of 21400548 is about 277.6354796621.

The spelling of 21400548 in words is "twenty-one million, four hundred thousand, five hundred forty-eight".