21688465366 has 16 divisors (see below), whose sum is σ = 32856379920. Its totient is φ = 10736460160.

The previous prime is 21688465361. The next prime is 21688465367. The reversal of 21688465366 is 66356488612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21688465361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 338850 + ... + 397738.

It is an arithmetic number, because the mean of its divisors is an integer number (2053523745).

Almost surely, 2^21688465366 is an apocalyptic number.

21688465366 is a deficient number, since it is larger than the sum of its proper divisors (11167914554).

21688465366 is a wasteful number, since it uses less digits than its factorization.

21688465366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60719.

The product of its digits is 9953280, while the sum is 55.

It can be divided in two parts, 21 and 688465366, that added together give a cube (688465387 = 883³).

The spelling of 21688465366 in words is "twenty-one billion, six hundred eighty-eight million, four hundred sixty-five thousand, three hundred sixty-six".