21345164444 has 12 divisors (see below), whose sum is σ = 38978126544. Its totient is φ = 10208556864.

The previous prime is 21345164443. The next prime is 21345164549. The reversal of 21345164444 is 44446154312.

It is a junction number, because it is equal to n+sod(n) for n = 21345164398 and 21345164407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21345164443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116006237 + ... + 116006420.

It is an arithmetic number, because the mean of its divisors is an integer number (3248177212).

Almost surely, 2^21345164444 is an apocalyptic number.

It is an amenable number.

21345164444 is a deficient number, since it is larger than the sum of its proper divisors (17632962100).

21345164444 is a wasteful number, since it uses less digits than its factorization.

21345164444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232012684 (or 232012682 counting only the distinct ones).

The product of its digits is 184320, while the sum is 38.

The spelling of 21345164444 in words is "twenty-one billion, three hundred forty-five million, one hundred sixty-four thousand, four hundred forty-four".