20021012111011 has 2 divisors, whose sum is σ = 20021012111012. Its totient is φ = 20021012111010.

The previous prime is 20021012111003. The next prime is 20021012111027. The reversal of 20021012111011 is 11011121012002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021012111011 - 2³ = 20021012111003 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021012110982 and 20021012111000.

It is not a weakly prime, because it can be changed into another prime (20021012111911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010506055505 + 10010506055506.

It is an arithmetic number, because the mean of its divisors is an integer number (10010506055506).

Almost surely, 2^{20021012111011} is an apocalyptic number.

20021012111011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021012111011 is an equidigital number, since it uses as much as digits as its factorization.

20021012111011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20021012111011 its reverse (11011121012002), we get a palindrome (31032133123013).

The spelling of 20021012111011 in words is "twenty trillion, twenty-one billion, twelve million, one hundred eleven thousand, eleven".