16621209681286 has 16 divisors (see below), whose sum is σ = 29263596968736. Its totient is φ = 6930851913216.

The previous prime is 16621209681259. The next prime is 16621209681331. The reversal of 16621209681286 is 68218690212661.

It is a happy number.

It is a super-2 number, since 2×16621209681286² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16621209681286.

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, 16043638171 + ... + 16043639206.

It is an arithmetic number, because the mean of its divisors is an integer number (1828974810546).

Almost surely, 2^{16621209681286} is an apocalyptic number.

16621209681286 is a deficient number, since it is larger than the sum of its proper divisors (12642387287450).

16621209681286 is a wasteful number, since it uses less digits than its factorization.

16621209681286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32087277423.

The product of its (nonzero) digits is 5971968, while the sum is 58.

The spelling of 16621209681286 in words is "sixteen trillion, six hundred twenty-one billion, two hundred nine million, six hundred eighty-one thousand, two hundred eighty-six".