21778986273 has 16 divisors (see below), whose sum is σ = 31795433472. Its totient is φ = 13150674000.

The previous prime is 21778986269. The next prime is 21778986293. The reversal of 21778986273 is 37268987712.

It is not a de Polignac number, because 21778986273 - 2² = 21778986269 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21778986253) 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 15 ways as a sum of consecutive naturals, for example, 1208713 + ... + 1226598.

It is an arithmetic number, because the mean of its divisors is an integer number (1987214592).

Almost surely, 2^21778986273 is an apocalyptic number.

It is an amenable number.

21778986273 is a deficient number, since it is larger than the sum of its proper divisors (10016447199).

21778986273 is a wasteful number, since it uses less digits than its factorization.

21778986273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2435596.

The product of its digits is 14224896, while the sum is 60.

The spelling of 21778986273 in words is "twenty-one billion, seven hundred seventy-eight million, nine hundred eighty-six thousand, two hundred seventy-three".