21506704266716 has 12 divisors (see below), whose sum is σ = 37636774648032. Its totient is φ = 10753340081568.

The previous prime is 21506704266713. The next prime is 21506704266727. The reversal of 21506704266716 is 61766240760512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21506704266713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1888016 + ... + 6824808.

It is an arithmetic number, because the mean of its divisors is an integer number (3136397887336).

Almost surely, 2^{21506704266716} is an apocalyptic number.

It is an amenable number.

21506704266716 is a deficient number, since it is larger than the sum of its proper divisors (16130070381316).

21506704266716 is a wasteful number, since it uses less digits than its factorization.

21506704266716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6025900 (or 6025898 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 21506704266716 in words is "twenty-one trillion, five hundred six billion, seven hundred four million, two hundred sixty-six thousand, seven hundred sixteen".