21779320754 has 16 divisors (see below), whose sum is σ = 33737389056. Its totient is φ = 10533828000.

The previous prime is 21779320753. The next prime is 21779320811. The reversal of 21779320754 is 45702397712.

It is a junction number, because it is equal to n+sod(n) for n = 21779320699 and 21779320708.

It is not an unprimeable number, because it can be changed into a prime (21779320753) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71054 + ... + 220470.

It is an arithmetic number, because the mean of its divisors is an integer number (2108586816).

Almost surely, 2^21779320754 is an apocalyptic number.

21779320754 is a deficient number, since it is larger than the sum of its proper divisors (11958068302).

21779320754 is a wasteful number, since it uses less digits than its factorization.

21779320754 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151801.

The product of its (nonzero) digits is 740880, while the sum is 47.

The spelling of 21779320754 in words is "twenty-one billion, seven hundred seventy-nine million, three hundred twenty thousand, seven hundred fifty-four".