21272718174827 has 16 divisors (see below), whose sum is σ = 25097644357632. Its totient is φ = 17644364170560.

The previous prime is 21272718174823. The next prime is 21272718174857. The reversal of 21272718174827 is 72847181727212.

It is not a de Polignac number, because 21272718174827 - 2² = 21272718174823 is a prime.

It is a super-2 number, since 2×21272718174827² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21272718174821) 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, 174293 + ... + 6525014.

It is an arithmetic number, because the mean of its divisors is an integer number (1568602772352).

Almost surely, 2^{21272718174827} is an apocalyptic number.

21272718174827 is a deficient number, since it is larger than the sum of its proper divisors (3824926182805).

21272718174827 is a wasteful number, since it uses less digits than its factorization.

21272718174827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6713978.

The product of its digits is 9834496, while the sum is 59.

The spelling of 21272718174827 in words is "twenty-one trillion, two hundred seventy-two billion, seven hundred eighteen million, one hundred seventy-four thousand, eight hundred twenty-seven".