21423319268 has 12 divisors (see below), whose sum is σ = 40374717180. Its totient is φ = 9887685792.

The previous prime is 21423319219. The next prime is 21423319277. The reversal of 21423319268 is 86291332412.

It can be written as a sum of positive squares in 2 ways, for example, as 10747883584 + 10675435684 = 103672^2 + 103322^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 205993403 + ... + 205993506.

It is an arithmetic number, because the mean of its divisors is an integer number (3364559765).

Almost surely, 2^21423319268 is an apocalyptic number.

It is an amenable number.

21423319268 is a deficient number, since it is larger than the sum of its proper divisors (18951397912).

21423319268 is a wasteful number, since it uses less digits than its factorization.

21423319268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411986926 (or 411986924 counting only the distinct ones).

The product of its digits is 124416, while the sum is 41.

The spelling of 21423319268 in words is "twenty-one billion, four hundred twenty-three million, three hundred nineteen thousand, two hundred sixty-eight".