21020321227 has 4 divisors (see below), whose sum is σ = 21745159920. Its totient is φ = 20295482536.

The previous prime is 21020321221. The next prime is 21020321237. The reversal of 21020321227 is 72212302012.

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 21020321227 - 2¹¹ = 21020319179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21020321198 and 21020321207.

It is not an unprimeable number, because it can be changed into a prime (21020321221) 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, 362419303 + ... + 362419360.

It is an arithmetic number, because the mean of its divisors is an integer number (5436289980).

Almost surely, 2^21020321227 is an apocalyptic number.

21020321227 is a deficient number, since it is larger than the sum of its proper divisors (724838693).

21020321227 is an equidigital number, since it uses as much as digits as its factorization.

21020321227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724838692.

The product of its (nonzero) digits is 672, while the sum is 22.

Adding to 21020321227 its reverse (72212302012), we get a palindrome (93232623239).

The spelling of 21020321227 in words is "twenty-one billion, twenty million, three hundred twenty-one thousand, two hundred twenty-seven".