21484746 has 24 divisors (see below), whose sum is σ = 46637604. Its totient is φ = 7148160.

The previous prime is 21484721. The next prime is 21484747. The reversal of 21484746 is 64748412.

It can be written as a sum of positive squares in 2 ways, for example, as 21483225 + 1521 = 4635^2 + 39^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21484746.

It is not an unprimeable number, because it can be changed into a prime (21484747) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15106 + ... + 16466.

Almost surely, 2^21484746 is an apocalyptic number.

21484746 is an abundant number, since it is smaller than the sum of its proper divisors (25152858).

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

21484746 is a wasteful number, since it uses less digits than its factorization.

21484746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2246 (or 2243 counting only the distinct ones).

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

The square root of 21484746 is about 4635.1640747659. The cubic root of 21484746 is about 277.9991114993. Note that the first 3 decimals are identical.

The spelling of 21484746 in words is "twenty-one million, four hundred eighty-four thousand, seven hundred forty-six".