21727545126503 has 4 divisors (see below), whose sum is σ = 21727561457280. Its totient is φ = 21727528795728.

The previous prime is 21727545126499. The next prime is 21727545126527. The reversal of 21727545126503 is 30562154572712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21727545126503 - 2² = 21727545126499 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21727545126563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5973575 + ... + 8895992.

It is an arithmetic number, because the mean of its divisors is an integer number (5431890364320).

Almost surely, 2^{21727545126503} is an apocalyptic number.

21727545126503 is a deficient number, since it is larger than the sum of its proper divisors (16330777).

21727545126503 is a wasteful number, since it uses less digits than its factorization.

21727545126503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16330776.

The product of its (nonzero) digits is 3528000, while the sum is 50.

The spelling of 21727545126503 in words is "twenty-one trillion, seven hundred twenty-seven billion, five hundred forty-five million, one hundred twenty-six thousand, five hundred three".