21247180479 has 24 divisors (see below), whose sum is σ = 35082657792. Its totient is φ = 12138495120.

The previous prime is 21247180459. The next prime is 21247180517. The reversal of 21247180479 is 97408174212.

It is not a de Polignac number, because 21247180479 - 2⁵ = 21247180447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21247180459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 260434 + ... + 332144.

It is an arithmetic number, because the mean of its divisors is an integer number (1461777408).

Almost surely, 2^21247180479 is an apocalyptic number.

21247180479 is a deficient number, since it is larger than the sum of its proper divisors (13835477313).

21247180479 is a wasteful number, since it uses less digits than its factorization.

21247180479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76427 (or 76424 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The spelling of 21247180479 in words is "twenty-one billion, two hundred forty-seven million, one hundred eighty thousand, four hundred seventy-nine".