21304778468 has 24 divisors (see below), whose sum is σ = 38921117760. Its totient is φ = 10184857760.

The previous prime is 21304778431. The next prime is 21304778531. The reversal of 21304778468 is 86487740312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170423 + ... + 267681.

It is an arithmetic number, because the mean of its divisors is an integer number (1621713240).

Almost surely, 2^21304778468 is an apocalyptic number.

It is an amenable number.

21304778468 is a deficient number, since it is larger than the sum of its proper divisors (17616339292).

21304778468 is a wasteful number, since it uses less digits than its factorization.

21304778468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99667 (or 99665 counting only the distinct ones).

The product of its (nonzero) digits is 1806336, while the sum is 50.

The spelling of 21304778468 in words is "twenty-one billion, three hundred four million, seven hundred seventy-eight thousand, four hundred sixty-eight".