21223203011011 has 2 divisors, whose sum is σ = 21223203011012. Its totient is φ = 21223203011010.

The previous prime is 21223203011009. The next prime is 21223203011047. The reversal of 21223203011011 is 11011030232212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223203011011 - 2¹ = 21223203011009 is a prime.

Together with 21223203011009, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21223203011011.

It is not a weakly prime, because it can be changed into another prime (21223203015011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611601505505 + 10611601505506.

It is an arithmetic number, because the mean of its divisors is an integer number (10611601505506).

Almost surely, 2^{21223203011011} is an apocalyptic number.

21223203011011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223203011011 is an equidigital number, since it uses as much as digits as its factorization.

21223203011011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 21223203011011 its reverse (11011030232212), we get a palindrome (32234233243223).

The spelling of 21223203011011 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred three million, eleven thousand, eleven".