21348884 has 12 divisors (see below), whose sum is σ = 37410324. Its totient is φ = 10660224.

The previous prime is 21348883. The next prime is 21348893. The reversal of 21348884 is 48884312.

It can be written as a sum of positive squares in 2 ways, for example, as 12180100 + 9168784 = 3490^2 + 3028^2 .

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284 + ... + 6540.

It is an arithmetic number, because the mean of its divisors is an integer number (3117527).

Almost surely, 2^21348884 is an apocalyptic number.

It is an amenable number.

21348884 is a deficient number, since it is larger than the sum of its proper divisors (16061440).

21348884 is a wasteful number, since it uses less digits than its factorization.

21348884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7114 (or 7112 counting only the distinct ones).

The product of its digits is 49152, while the sum is 38.

The square root of 21348884 is about 4620.4852559012. The cubic root of 21348884 is about 277.4118823106.

The spelling of 21348884 in words is "twenty-one million, three hundred forty-eight thousand, eight hundred eighty-four".