21120012227 has 16 divisors (see below), whose sum is σ = 21922897920. Its totient is φ = 20325016800.

The previous prime is 21120012197. The next prime is 21120012253. The reversal of 21120012227 is 72221002112.

It is a cyclic number.

It is not a de Polignac number, because 21120012227 - 2¹² = 21120008131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21120012199 and 21120012208.

It is not an unprimeable number, because it can be changed into a prime (21120012427) 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, 5387174 + ... + 5391092.

It is an arithmetic number, because the mean of its divisors is an integer number (1370181120).

Almost surely, 2^21120012227 is an apocalyptic number.

21120012227 is a deficient number, since it is larger than the sum of its proper divisors (802885693).

21120012227 is a wasteful number, since it uses less digits than its factorization.

21120012227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4874.

The product of its (nonzero) digits is 224, while the sum is 20.

Adding to 21120012227 its reverse (72221002112), we get a palindrome (93341014339).

The spelling of 21120012227 in words is "twenty-one billion, one hundred twenty million, twelve thousand, two hundred twenty-seven".