21222120011011 has 4 divisors (see below), whose sum is σ = 21953917252800. Its totient is φ = 20490322769224.

The previous prime is 21222120011003. The next prime is 21222120011023. The reversal of 21222120011011 is 11011002122212.

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 21222120011011 - 2³ = 21222120011003 is a prime.

It is a super-2 number, since 2×21222120011011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222120011041) 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, 365898620851 + ... + 365898620908.

It is an arithmetic number, because the mean of its divisors is an integer number (5488479313200).

Almost surely, 2^{21222120011011} is an apocalyptic number.

21222120011011 is a deficient number, since it is larger than the sum of its proper divisors (731797241789).

21222120011011 is an equidigital number, since it uses as much as digits as its factorization.

21222120011011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 731797241788.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21222120011011 its reverse (11011002122212), we get a palindrome (32233122133223).

The spelling of 21222120011011 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, eleven thousand, eleven".