21120322111 has 4 divisors (see below), whose sum is σ = 24137510992. Its totient is φ = 18103133232.

The previous prime is 21120322061. The next prime is 21120322117. The reversal of 21120322111 is 11122302112.

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 21120322111 - 2⁷ = 21120321983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120322117) 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, 1508594430 + ... + 1508594443.

It is an arithmetic number, because the mean of its divisors is an integer number (6034377748).

Almost surely, 2^21120322111 is an apocalyptic number.

21120322111 is a deficient number, since it is larger than the sum of its proper divisors (3017188881).

21120322111 is an equidigital number, since it uses as much as digits as its factorization.

21120322111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017188880.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21120322111 its reverse (11122302112), we get a palindrome (32242624223).

The spelling of 21120322111 in words is "twenty-one billion, one hundred twenty million, three hundred twenty-two thousand, one hundred eleven".