21026663016 has 16 divisors (see below), whose sum is σ = 52566657600. Its totient is φ = 7008887664.

The previous prime is 21026663011. The next prime is 21026663093. The reversal of 21026663016 is 61036662012.

It is not an unprimeable number, because it can be changed into a prime (21026663011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438055456 + ... + 438055503.

It is an arithmetic number, because the mean of its divisors is an integer number (3285416100).

Almost surely, 2^21026663016 is an apocalyptic number.

It is an amenable number.

21026663016 is an abundant number, since it is smaller than the sum of its proper divisors (31539994584).

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

21026663016 is a wasteful number, since it uses less digits than its factorization.

21026663016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876110968 (or 876110964 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The spelling of 21026663016 in words is "twenty-one billion, twenty-six million, six hundred sixty-three thousand, sixteen".