21266716326 has 16 divisors (see below), whose sum is σ = 42858116928. Its totient is φ = 7034791400.

The previous prime is 21266716319. The next prime is 21266716337. The reversal of 21266716326 is 62361766212.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13527660 + ... + 13529231.

It is an arithmetic number, because the mean of its divisors is an integer number (2678632308).

Almost surely, 2^21266716326 is an apocalyptic number.

21266716326 is an abundant number, since it is smaller than the sum of its proper divisors (21591400602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21266716326 is a wasteful number, since it uses less digits than its factorization.

21266716326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27057027.

The product of its digits is 217728, while the sum is 42.

The spelling of 21266716326 in words is "twenty-one billion, two hundred sixty-six million, seven hundred sixteen thousand, three hundred twenty-six".