21445810278 has 16 divisors (see below), whose sum is σ = 44050854000. Its totient is φ = 6955397856.

The previous prime is 21445810249. The next prime is 21445810289. The reversal of 21445810278 is 87201854412.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 48301153 + ... + 48301596.

It is an arithmetic number, because the mean of its divisors is an integer number (2753178375).

Almost surely, 2^21445810278 is an apocalyptic number.

21445810278 is an abundant number, since it is smaller than the sum of its proper divisors (22605043722).

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

21445810278 is a wasteful number, since it uses less digits than its factorization.

21445810278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96602791.

The product of its (nonzero) digits is 143360, while the sum is 42.

The spelling of 21445810278 in words is "twenty-one billion, four hundred forty-five million, eight hundred ten thousand, two hundred seventy-eight".