21300557227 has 4 divisors (see below), whose sum is σ = 21341441736. Its totient is φ = 21259672720.

The previous prime is 21300557203. The next prime is 21300557231. The reversal of 21300557227 is 72275500312.

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 21300557227 - 2¹¹ = 21300555179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21300557192 and 21300557201.

It is not an unprimeable number, because it can be changed into a prime (21300557237) 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, 20441473 + ... + 20442514.

It is an arithmetic number, because the mean of its divisors is an integer number (5335360434).

Almost surely, 2^21300557227 is an apocalyptic number.

21300557227 is a deficient number, since it is larger than the sum of its proper divisors (40884509).

21300557227 is an equidigital number, since it uses as much as digits as its factorization.

21300557227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40884508.

The product of its (nonzero) digits is 29400, while the sum is 34.

The spelling of 21300557227 in words is "twenty-one billion, three hundred million, five hundred fifty-seven thousand, two hundred twenty-seven".