21220120011011 has 2 divisors, whose sum is σ = 21220120011012. Its totient is φ = 21220120011010.

The previous prime is 21220120011007. The next prime is 21220120011017. The reversal of 21220120011011 is 11011002102212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21220120011011 - 2² = 21220120011007 is a prime.

It is a super-2 number, since 2×21220120011011² (a number of 27 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21220120011017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610060005505 + 10610060005506.

It is an arithmetic number, because the mean of its divisors is an integer number (10610060005506).

Almost surely, 2^{21220120011011} is an apocalyptic number.

21220120011011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21220120011011 is an equidigital number, since it uses as much as digits as its factorization.

21220120011011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21220120011011 its reverse (11011002102212), we get a palindrome (32231122113223).

The spelling of 21220120011011 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty million, eleven thousand, eleven".