21880207305 has 48 divisors (see below), whose sum is σ = 41604788160. Its totient is φ = 10549276800.

The previous prime is 21880207301. The next prime is 21880207331. The reversal of 21880207305 is 50370208812.

It is not a de Polignac number, because 21880207305 - 2² = 21880207301 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21880207305.

It is not an unprimeable number, because it can be changed into a prime (21880207301) 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 47 ways as a sum of consecutive naturals, for example, 34866 + ... + 212075.

It is an arithmetic number, because the mean of its divisors is an integer number (866766420).

Almost surely, 2^21880207305 is an apocalyptic number.

It is an amenable number.

21880207305 is a deficient number, since it is larger than the sum of its proper divisors (19724580855).

21880207305 is a wasteful number, since it uses less digits than its factorization.

21880207305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247142 (or 247139 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 21880207305 in words is "twenty-one billion, eight hundred eighty million, two hundred seven thousand, three hundred five".