21643216270 has 32 divisors (see below), whose sum is σ = 42369959520. Its totient is φ = 7912214400.

The previous prime is 21643216237. The next prime is 21643216327. The reversal of 21643216270 is 7261234612.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811060 + ... + 837319.

It is an arithmetic number, because the mean of its divisors is an integer number (1324061235).

Almost surely, 2^21643216270 is an apocalyptic number.

21643216270 is a deficient number, since it is larger than the sum of its proper divisors (20726743250).

21643216270 is a wasteful number, since it uses less digits than its factorization.

21643216270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1648500.

The product of its (nonzero) digits is 24192, while the sum is 34.

The spelling of 21643216270 in words is "twenty-one billion, six hundred forty-three million, two hundred sixteen thousand, two hundred seventy".