21454476 has 48 divisors (see below), whose sum is σ = 53343360. Its totient is φ = 6688000.

The previous prime is 21454441. The next prime is 21454483. The reversal of 21454476 is 67445412.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50995 + ... + 51413.

It is an arithmetic number, because the mean of its divisors is an integer number (1111320).

Almost surely, 2^21454476 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 21454476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26671680).

21454476 is an abundant number, since it is smaller than the sum of its proper divisors (31888884).

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

21454476 is a wasteful number, since it uses less digits than its factorization.

21454476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 692 counting only the distinct ones).

The product of its digits is 26880, while the sum is 33.

The square root of 21454476 is about 4631.8976672634. The cubic root of 21454476 is about 277.8684918774.

Adding to 21454476 its reverse (67445412), we get a palindrome (88899888).

The spelling of 21454476 in words is "twenty-one million, four hundred fifty-four thousand, four hundred seventy-six".