21102566775212 has 48 divisors (see below), whose sum is σ = 40322206606752. Its totient is φ = 9605175920640.

The previous prime is 21102566775211. The next prime is 21102566775361. The reversal of 21102566775212 is 21257766520112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21102566775211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5964239 + ... + 8819142.

It is an arithmetic number, because the mean of its divisors is an integer number (840045970974).

Almost surely, 2^{21102566775212} is an apocalyptic number.

It is an amenable number.

21102566775212 is a deficient number, since it is larger than the sum of its proper divisors (19219639831540).

21102566775212 is a wasteful number, since it uses less digits than its factorization.

21102566775212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14783778 (or 14783776 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 47.

The spelling of 21102566775212 in words is "twenty-one trillion, one hundred two billion, five hundred sixty-six million, seven hundred seventy-five thousand, two hundred twelve".