21454552 has 48 divisors (see below), whose sum is σ = 47196000. Its totient is φ = 9116352.

The previous prime is 21454547. The next prime is 21454613. The reversal of 21454552 is 25545412.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21454552.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89649 + ... + 89887.

It is an arithmetic number, because the mean of its divisors is an integer number (983250).

Almost surely, 2^21454552 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 21454552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23598000).

21454552 is an abundant number, since it is smaller than the sum of its proper divisors (25741448).

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

21454552 is a wasteful number, since it uses less digits than its factorization.

21454552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 477 counting only the distinct ones).

The product of its digits is 8000, while the sum is 28.

The square root of 21454552 is about 4631.9058712370. The cubic root of 21454552 is about 277.8688199827.

Adding to 21454552 its reverse (25545412), we get a palindrome (46999964).

The spelling of 21454552 in words is "twenty-one million, four hundred fifty-four thousand, five hundred fifty-two".