21304443777 has 16 divisors (see below), whose sum is σ = 28756022400. Its totient is φ = 14028498432.

The previous prime is 21304443763. The next prime is 21304443799. The reversal of 21304443777 is 77734440312.

It is not a de Polignac number, because 21304443777 - 2⁷ = 21304443649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21304443977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73599 + ... + 219147.

It is an arithmetic number, because the mean of its divisors is an integer number (1797251400).

Almost surely, 2^21304443777 is an apocalyptic number.

It is an amenable number.

21304443777 is a deficient number, since it is larger than the sum of its proper divisors (7451578623).

21304443777 is a wasteful number, since it uses less digits than its factorization.

21304443777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146152.

The product of its (nonzero) digits is 395136, while the sum is 42.

The spelling of 21304443777 in words is "twenty-one billion, three hundred four million, four hundred forty-three thousand, seven hundred seventy-seven".