21280042208 has 24 divisors (see below), whose sum is σ = 41930452872. Its totient is φ = 10631038336.

The previous prime is 21280042207. The next prime is 21280042271. The reversal of 21280042208 is 80224008212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21280042207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242135 + ... + 318102.

It is an arithmetic number, because the mean of its divisors is an integer number (1747102203).

Almost surely, 2^21280042208 is an apocalyptic number.

It is an amenable number.

21280042208 is a deficient number, since it is larger than the sum of its proper divisors (20650410664).

21280042208 is a wasteful number, since it uses less digits than its factorization.

21280042208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561434 (or 561426 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The spelling of 21280042208 in words is "twenty-one billion, two hundred eighty million, forty-two thousand, two hundred eight".