21564548148 has 96 divisors (see below), whose sum is σ = 59161116672. Its totient is φ = 6027235200.

The previous prime is 21564548143. The next prime is 21564548153. The reversal of 21564548148 is 84184546512.

It is an interprime number because it is at equal distance from previous prime (21564548143) and next prime (21564548153).

It is a junction number, because it is equal to n+sod(n) for n = 21564548097 and 21564548106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21564548141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2519965 + ... + 2528507.

It is an arithmetic number, because the mean of its divisors is an integer number (616261632).

Almost surely, 2^21564548148 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21564548148, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29580558336).

21564548148 is an abundant number, since it is smaller than the sum of its proper divisors (37596568524).

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

21564548148 is a wasteful number, since it uses less digits than its factorization.

21564548148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10045 (or 10043 counting only the distinct ones).

The product of its digits is 1228800, while the sum is 48.

The spelling of 21564548148 in words is "twenty-one billion, five hundred sixty-four million, five hundred forty-eight thousand, one hundred forty-eight".