21880905886 has 16 divisors (see below), whose sum is σ = 37512042336. Its totient is φ = 9377051616.

The previous prime is 21880905869. The next prime is 21880905889. The reversal of 21880905886 is 68850908812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21880905889) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 455320 + ... + 501076.

It is an arithmetic number, because the mean of its divisors is an integer number (2344502646).

Almost surely, 2^21880905886 is an apocalyptic number.

21880905886 is a deficient number, since it is larger than the sum of its proper divisors (15631136450).

21880905886 is a wasteful number, since it uses less digits than its factorization.

21880905886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79923.

The product of its (nonzero) digits is 2211840, while the sum is 55.

The spelling of 21880905886 in words is "twenty-one billion, eight hundred eighty million, nine hundred five thousand, eight hundred eighty-six".