21348544 has 28 divisors (see below), whose sum is σ = 48416464. Its totient is φ = 9149184.

The previous prime is 21348541. The next prime is 21348557. The reversal of 21348544 is 44584312.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (21348541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23379 + ... + 24274.

Almost surely, 2^21348544 is an apocalyptic number.

It is an amenable number.

21348544 is an abundant number, since it is smaller than the sum of its proper divisors (27067920).

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

21348544 is an equidigital number, since it uses as much as digits as its factorization.

21348544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47672 (or 47662 counting only the distinct ones).

The product of its digits is 15360, while the sum is 31.

The square root of 21348544 is about 4620.4484630823. The cubic root of 21348544 is about 277.4104096257.

The spelling of 21348544 in words is "twenty-one million, three hundred forty-eight thousand, five hundred forty-four".