21577852485227 has 4 divisors (see below), whose sum is σ = 21585894922680. Its totient is φ = 21569810047776.

The previous prime is 21577852485199. The next prime is 21577852485239. The reversal of 21577852485227 is 72258425877512.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21577852485227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21577852485727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4021214702 + ... + 4021220067.

It is an arithmetic number, because the mean of its divisors is an integer number (5396473730670).

Almost surely, 2^{21577852485227} is an apocalyptic number.

21577852485227 is a deficient number, since it is larger than the sum of its proper divisors (8042437453).

21577852485227 is an equidigital number, since it uses as much as digits as its factorization.

21577852485227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8042437452.

The product of its digits is 175616000, while the sum is 65.

The spelling of 21577852485227 in words is "twenty-one trillion, five hundred seventy-seven billion, eight hundred fifty-two million, four hundred eighty-five thousand, two hundred twenty-seven".