21873298 has 4 divisors (see below), whose sum is σ = 32809950. Its totient is φ = 10936648.

The previous prime is 21873277. The next prime is 21873311. The reversal of 21873298 is 89237812.

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., 11068929 + 10804369 = 3327^2 + 3287^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 21873298.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is an upside-down number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5468323 + ... + 5468326.

Almost surely, 2^21873298 is an apocalyptic number.

21873298 is a deficient number, since it is larger than the sum of its proper divisors (10936652).

21873298 is a wasteful number, since it uses less digits than its factorization.

21873298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10936651.

The product of its digits is 48384, while the sum is 40.

The square root of 21873298 is about 4676.8897784746. The cubic root of 21873298 is about 279.6649819662.

The spelling of 21873298 in words is "twenty-one million, eight hundred seventy-three thousand, two hundred ninety-eight".