20012201011111 has 2 divisors, whose sum is σ = 20012201011112. Its totient is φ = 20012201011110.

The previous prime is 20012201011087. The next prime is 20012201011123. The reversal of 20012201011111 is 11111010221002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20012201011111 - 2⁵ = 20012201011079 is a prime.

It is a super-2 number, since 2×20012201011111² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20012201011091 and 20012201011100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20012201011181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006100505555 + 10006100505556.

It is an arithmetic number, because the mean of its divisors is an integer number (10006100505556).

Almost surely, 2^{20012201011111} is an apocalyptic number.

20012201011111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20012201011111 is an equidigital number, since it uses as much as digits as its factorization.

20012201011111 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 20012201011111 its reverse (11111010221002), we get a palindrome (31123211232113).

The spelling of 20012201011111 in words is "twenty trillion, twelve billion, two hundred one million, eleven thousand, one hundred eleven".