21726041365206 has 24 divisors (see below), whose sum is σ = 47074151966400. Its totient is φ = 7241850351216.

The previous prime is 21726041365201. The next prime is 21726041365247. The reversal of 21726041365206 is 60256314062712.

21726041365206 is a `hidden beast` number, since 2 + 1 + 7 + 2 + 604 + 1 + 36 + 5 + 2 + 0 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21726041365201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12798681 + ... + 14396468.

It is an arithmetic number, because the mean of its divisors is an integer number (1961422998600).

Almost surely, 2^{21726041365206} is an apocalyptic number.

21726041365206 is an abundant number, since it is smaller than the sum of its proper divisors (25348110601194).

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

21726041365206 is a wasteful number, since it uses less digits than its factorization.

21726041365206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27239540 (or 27239537 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 45.

The spelling of 21726041365206 in words is "twenty-one trillion, seven hundred twenty-six billion, forty-one million, three hundred sixty-five thousand, two hundred six".