21164160544 has 48 divisors (see below), whose sum is σ = 42112405440. Its totient is φ = 10469113600.

The previous prime is 21164160533. The next prime is 21164160571. The reversal of 21164160544 is 44506146112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7946157 + ... + 7948819.

It is an arithmetic number, because the mean of its divisors is an integer number (877341780).

Almost surely, 2^21164160544 is an apocalyptic number.

It is an amenable number.

21164160544 is a deficient number, since it is larger than the sum of its proper divisors (20948244896).

21164160544 is a wasteful number, since it uses less digits than its factorization.

21164160544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233 (or 5225 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The spelling of 21164160544 in words is "twenty-one billion, one hundred sixty-four million, one hundred sixty thousand, five hundred forty-four".