21707266523461 has 8 divisors (see below), whose sum is σ = 21711873290904. Its totient is φ = 21702660188160.

The previous prime is 21707266523399. The next prime is 21707266523507. The reversal of 21707266523461 is 16432566270712.

It can be written as a sum of positive squares in 4 ways, for example, as 5165915308225 + 16541351215236 = 2272865^2 + 4067106^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21707266523461 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21707266523399 and 21707266523408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707266521461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112518295 + ... + 112711051.

It is an arithmetic number, because the mean of its divisors is an integer number (2713984161363).

Almost surely, 2^{21707266523461} is an apocalyptic number.

It is an amenable number.

21707266523461 is a deficient number, since it is larger than the sum of its proper divisors (4606767443).

21707266523461 is a wasteful number, since it uses less digits than its factorization.

21707266523461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216071.

The product of its (nonzero) digits is 5080320, while the sum is 52.

The spelling of 21707266523461 in words is "twenty-one trillion, seven hundred seven billion, two hundred sixty-six million, five hundred twenty-three thousand, four hundred sixty-one".