21208882 has 4 divisors (see below), whose sum is σ = 31813326. Its totient is φ = 10604440.

The previous prime is 21208879. The next prime is 21208903. The reversal of 21208882 is 28880212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 21150801 + 58081 = 4599^2 + 241^2 .

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 as a sum of consecutive naturals, namely, 5302219 + ... + 5302222.

Almost surely, 2^21208882 is an apocalyptic number.

21208882 is a deficient number, since it is larger than the sum of its proper divisors (10604444).

21208882 is a wasteful number, since it uses less digits than its factorization.

21208882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10604443.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 21208882 is about 4605.3101958500. The cubic root of 21208882 is about 276.8041467659.

The spelling of 21208882 in words is "twenty-one million, two hundred eight thousand, eight hundred eighty-two".