21727550547705 has 16 divisors (see below), whose sum is σ = 34769333200320. Its totient is φ = 11586276184128.

The previous prime is 21727550547667. The next prime is 21727550547709. The reversal of 21727550547705 is 50774505572712.

It is not a de Polignac number, because 21727550547705 - 2⁹ = 21727550547193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21727550547709) 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, 109320822 + ... + 109519391.

It is an arithmetic number, because the mean of its divisors is an integer number (2173083325020).

Almost surely, 2^{21727550547705} is an apocalyptic number.

It is an amenable number.

21727550547705 is a deficient number, since it is larger than the sum of its proper divisors (13041782652615).

21727550547705 is a wasteful number, since it uses less digits than its factorization.

21727550547705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218846840.

The product of its (nonzero) digits is 24010000, while the sum is 57.

The spelling of 21727550547705 in words is "twenty-one trillion, seven hundred twenty-seven billion, five hundred fifty million, five hundred forty-seven thousand, seven hundred five".