21448476 has 120 divisors (see below), whose sum is σ = 65727200. Its totient is φ = 6096384.

The previous prime is 21448463. The next prime is 21448477. The reversal of 21448476 is 67484412.

21448476 = T₁₆₈ + T₁₆₉ + ... + T₅₁₀.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21448476.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21448477) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 111036 + ... + 111228.

Almost surely, 2^21448476 is an apocalyptic number.

21448476 is the 2316-th decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21448476, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32863600).

21448476 is an abundant number, since it is smaller than the sum of its proper divisors (44278724).

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

21448476 is a wasteful number, since it uses less digits than its factorization.

21448476 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 205 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 21448476 is about 4631.2499392713. The cubic root of 21448476 is about 277.8425863834.

The spelling of 21448476 in words is "twenty-one million, four hundred forty-eight thousand, four hundred seventy-six".